Chris Parker
Grandmaster
Quite a necro here.... let's see if we can at least put some real answers here, such as they exist....
Shinmen Musashi no Kami Fujiwara no Genshin is, to say the least, a rather controversial figure amongst Japanese swordsmen and Koryu systems. It has gone so far as to suggest that many very well established things attributed to Musashi may not have actually come from him, including his famous self portrait, and even up to the Gorin no Sho (Book of Five Rings/Tombstone Book). What stories attributed to him are also in question, as at least four people (during Musashi's lifetime) seem to have used his name, similar to there being many who used the name Hanzo Hattori. And Musashi himself used a number of names himself, including Miyamoto Bennosuke, Shinmen Takezo, and Niten Doraku.
His early training appears to have been under his father, which by all accounts was rather harsh. His father, Munisai, was said to be a master of the Jitte (not, it must be stated, the Jutte), and was the founder of a system of the weapons use. He also was an accomplished swordsman, however it is doubted how much Musashi learnt from him, due on no small part to the fact that Munisai's gravestone gives a date of death four years before Musashi's accepted birth... It is thought that Musashi learnt from his Uncle (Dorin) the system of Jitte and sword that his father (Munisai) left, until from the age of 7, until about 12 or 13. At that point he left, and soon came across a warrior from the Shinto Ryu (either the then-current name for Katori Shinto Ryu, which has been known by a number of names over it's existence, or Tsukahara Bokuden's Shinto Ryu, which came from Katori Shinto Ryu itself), named Arima Kihei, who was in town accepting challenges to further his skill. Musashi, 13 years old, beat him to death brutally with a stick.
He then continued moving around the country, duelling and learning (in his own rough fashion), establishing the reputation he came to have (both good and bad). How much of this is fact is very open to debate, as indeed are all the "facts" I have gone through here (the Arima story is suspect in a number of details, for example).
When he was older (his last duel, the famous duel at Ganryu Island against Sasaki Kojiro was when he was 29), he "retired" to a cave in Kumumoto, and took his Bhuddist name, as well as working on his own system based on his experiences. The result of which is the Hyoho Niten Ichi Ryu. This system features no Iai within it's techniques, other than a specific way to draw two swords in the Nito Seiho (two sword formal methods).
Opinions of Musashi range from him being borderline-Godlike in his ability and feats, through to a fairly low opinion which refers to the fact that his one battle saw him on the losing side (and many dispute his appearance there at all), him being taken out of it by a simple rock thrown from a foot soldier which hits him in the leg, and more. Personally, I think he was somewhere in between.
Things such as "He fought with two swords when everyone was tought to wield their swords two-handed, with a bokken vs. steel, and sometimes no sword at all, catching his opponent's blade with his bare hands. He even fought a duel once with a log, knowing that it would upset his opponent even more and throw him off." are frankly in the former basket, though. Fighting with two swords existed before Musashi (Tenshin Shoden Katori Shinto Ryu had been teaching Ryotojutsu [two-sword art] for over 100 years before Musashi, Musashi rarely actually used his two-sword techniques, most often using either a single long or short sword (his main use of two swords was in an ambush where he allegedly fought off a group of about 10 men... of course, what is often glanced over is the way he killed a young chld as a "distraction" on the way to that particular duel....), catching a sword with your bare hands is basically misunderstanding the Shinken Shiraha Dome approach of a number of older systems (although Musashi's Jujutsu skills were said to be quite good, and that again is rather forgotten in the emphasis on his swordsmanship), and the duel with a log is part of a fictionalised woodblock print series, similar to ones depicting Bokuden and others.
So, in short, there is little known in any real, concrete way about Musashi (whoever he may have been) and his training, however there is no account of Iai being part of his training, and it makes no appearance in his Hyoho Niten Ichi Ryu system. And as his art is about duelling, more than anything else, and Iai is more for surprise attacks (particularly in koryu systems), I would be rather surprised to find it there.
Shinmen Musashi no Kami Fujiwara no Genshin is, to say the least, a rather controversial figure amongst Japanese swordsmen and Koryu systems. It has gone so far as to suggest that many very well established things attributed to Musashi may not have actually come from him, including his famous self portrait, and even up to the Gorin no Sho (Book of Five Rings/Tombstone Book). What stories attributed to him are also in question, as at least four people (during Musashi's lifetime) seem to have used his name, similar to there being many who used the name Hanzo Hattori. And Musashi himself used a number of names himself, including Miyamoto Bennosuke, Shinmen Takezo, and Niten Doraku.
His early training appears to have been under his father, which by all accounts was rather harsh. His father, Munisai, was said to be a master of the Jitte (not, it must be stated, the Jutte), and was the founder of a system of the weapons use. He also was an accomplished swordsman, however it is doubted how much Musashi learnt from him, due on no small part to the fact that Munisai's gravestone gives a date of death four years before Musashi's accepted birth... It is thought that Musashi learnt from his Uncle (Dorin) the system of Jitte and sword that his father (Munisai) left, until from the age of 7, until about 12 or 13. At that point he left, and soon came across a warrior from the Shinto Ryu (either the then-current name for Katori Shinto Ryu, which has been known by a number of names over it's existence, or Tsukahara Bokuden's Shinto Ryu, which came from Katori Shinto Ryu itself), named Arima Kihei, who was in town accepting challenges to further his skill. Musashi, 13 years old, beat him to death brutally with a stick.
He then continued moving around the country, duelling and learning (in his own rough fashion), establishing the reputation he came to have (both good and bad). How much of this is fact is very open to debate, as indeed are all the "facts" I have gone through here (the Arima story is suspect in a number of details, for example).
When he was older (his last duel, the famous duel at Ganryu Island against Sasaki Kojiro was when he was 29), he "retired" to a cave in Kumumoto, and took his Bhuddist name, as well as working on his own system based on his experiences. The result of which is the Hyoho Niten Ichi Ryu. This system features no Iai within it's techniques, other than a specific way to draw two swords in the Nito Seiho (two sword formal methods).
Opinions of Musashi range from him being borderline-Godlike in his ability and feats, through to a fairly low opinion which refers to the fact that his one battle saw him on the losing side (and many dispute his appearance there at all), him being taken out of it by a simple rock thrown from a foot soldier which hits him in the leg, and more. Personally, I think he was somewhere in between.
Things such as "He fought with two swords when everyone was tought to wield their swords two-handed, with a bokken vs. steel, and sometimes no sword at all, catching his opponent's blade with his bare hands. He even fought a duel once with a log, knowing that it would upset his opponent even more and throw him off." are frankly in the former basket, though. Fighting with two swords existed before Musashi (Tenshin Shoden Katori Shinto Ryu had been teaching Ryotojutsu [two-sword art] for over 100 years before Musashi, Musashi rarely actually used his two-sword techniques, most often using either a single long or short sword (his main use of two swords was in an ambush where he allegedly fought off a group of about 10 men... of course, what is often glanced over is the way he killed a young chld as a "distraction" on the way to that particular duel....), catching a sword with your bare hands is basically misunderstanding the Shinken Shiraha Dome approach of a number of older systems (although Musashi's Jujutsu skills were said to be quite good, and that again is rather forgotten in the emphasis on his swordsmanship), and the duel with a log is part of a fictionalised woodblock print series, similar to ones depicting Bokuden and others.
So, in short, there is little known in any real, concrete way about Musashi (whoever he may have been) and his training, however there is no account of Iai being part of his training, and it makes no appearance in his Hyoho Niten Ichi Ryu system. And as his art is about duelling, more than anything else, and Iai is more for surprise attacks (particularly in koryu systems), I would be rather surprised to find it there.