I dunno. We do a lot of kenjutsu in my dojo - which is good because I am very, very drawn to kenjutsu and my only other option to augment my training would be to travel nearly 300km one way trip to train in Tenshin Shoden Katori Shinto Ryu (I noticed some people break the words up differently, but this was how the instructor wrote it) which although I'd like to do is not currently an option.
We do sword vs sword stuff (with bokken mostly although on occasion I have had to face down shinken in very slow controlled kata in order to help remove the mental blocks which would pop up under the circumstances) as well as solo kata.
I can't comment on comparisons to other ryuha as I have not had enough experience in anything else however I can say that what we are taught seems to hold water with things I hear - even things such as cutting relying on "tip speed" and havin clean cuts with tameshigiri, rather than fishtails from bearing down with the forearm or trying to put "power" into cuts.
I also noticed a few things some other stuff I have seen doesn't appear to have (although I view only as an outsider with the other things bear in mind) such as the left pinky finger positioning and a phenomena I could only really describe as "flow" moving through evasion through cut through defense through whatever it needs to be.
I'd hazard that most other systems would have these things, mind, although from where I've been I've either not seen them, or not known enough about how they do it to have noticed!
So another long winded space cadet post from Indagator... my .02 summed up though, no harm in augmenting with other sword systems if it's available however there is a lot more to the Bujinkan and to Soke than what is shown publicly on the internet!
My dojo has nothing publicly available aside from a minor website listing info you could get anywhere on the web. That being said, we do have our resources!
Ha, my friend, that's far from long-winded... trust me on that.
From your basic description there, it strikes me that you're training either in something sourced from outside the Bujinkan itself, or something that your instructor is making up themselves. That's not necessarily a bad thing, I create drills myself fairly regularly. I will say that the idea of facing a Shinken is not something I'd be suggesting. I've used an Iaito with my guys, that's a close enough image to get the adrenaline going, a Shinken is something only the most experienced even consider going up against. It's just too dangerous.
In terms of there being more to the Bujinkan (and to Soke) than what is shown publicly, look, to be honest, that's a unique claim to the Bujinkan itself. I'm going to try to couch this as gently as I can, but, frankly Hatsumi himself is the cause of that idea. Without getting into the reasons for it, Hatsumi tends to imply a lot that there are things untaught (from the material itself), which has a number of members of the Bujinkan making claims like "well, I haven't been told there isn't any crochet patterns in Gikan Ryu, so maybe there are some! Only Hatsumi can tell you, you know..." The next part on from that is members saying that they don't know what is, or is not in any of the Ryu. That is unusual to the point of being bizarre, so you know. Every other Ryu out there, the information of what is included in the syllabus is very easy to find out, even what is contained in the "secret" sections. To take Tenshinsho Den Katori Shinto Ryu as an example (both forms of separation are fine, the Sugino line, and older mainline publications use the one you gave, the one I use is more common with the Otake dojo/mainline today. In kanji it's simply
天真正伝香取神道流), the secret sections are some Kenjutsu, as well as aspects of ninjutsu, castle fortification, battlefield tactics, and things like Kuji, although only the Kenjutsu is considered "secret teachings". The rest are higher level forms and teachings of other sections (Gogyo no Tachi, Gokui no Iai, Gogyo no Bo, Gogyo no Naginata etc). The only art where you can even ask the practitioners if something is in one of the Ryu and they'll say "I don't know, I haven't been told if there is or not yet" is the Bujinkan.
Where the claim has some validity is that the art that's really taught in the Bujinkan isn't any of the Ryu, it's Budo Taijutsu. And Budo Taijutsu is, in a very real way, whatever Hatsumi says it is at that point in time. And, with his preference for never repeating a technique (another sign that he's not teaching the Ryu, by the way), instead preferring spontaneous exploration of ideas and concepts, so long as he stays creative, then there's no limit to what he can present, and trying to capture it all is only ever going to be a futile gesture at best. He does use this a fair bit by constantly saying things like "I haven't shown this (version of this kata) before", or "if you're not here now, you're not going to understand (whatever, say, Tachi)". The downside is that most of what he's showing is completely untested, to be frank. After all, how can it be tested if he's creating it in the moment? The principles can be solid, but the explorations are sometimes less-than-ideal.
In terms of the details you're referring to (the pinky finger etc), I'd need to see what you're talking about to see where it may have come from. And when you start bringing in other sword systems to augment the Bujinkan ones, that can be a little dangerous and counter-productive as well, honestly. I'm currently allowing some of my seniors to specialize in a Ryu and a weapon of their choice, and two of my guys have been told they are not allowed to pick sword. The reason is that they are already training in a Koryu sword system with me outside of the Ninjutsu material, and the differences between the two approaches to sword are gigantic. Kamae, movement, footwork, grip, cutting, tactics, philosophy, structure, weaponry, everything is completely different. And by having two rather contradictory approaches to the same weapon leads to, at best, taking much longer to get anywhere. So I'm not letting them train sword in my regular classes. As a result, if you're going to bring in something from outside, it would need to be compatible with the rest of what is taught. But, honestly, although the Kukishinden Ryu sword syllabus is relatively small (9 kata, with variations on each, along with 3 kodachi kata with 2 or 3 variations on each, and 5 jutte kata), it's actually more than enough to have a complete focus on sword. What you're missing, though, is any Iai. So if you want that, you'd need to look outside the Bujinkan material (there are some concepts within Shinden Fudo Ryu, and some Batto methods in Togakure, but no real Iai kata).
What about the togakure ryu's useage of the sword as presented by hatsumi? Do you feel that the way it is presented is better than the other sword work done in the x-kans? What would you recomend a to a person studying in the bujinkan who also wanted to learn proper sword work?
Ah, Togakure Ryu... it's an interesting approach to sword, really. It relies, in a number of kata, on a specialist sword, taking advantage of the particular dimensions for effective use. The basic idea is one of "shielding", with frequent use of "beat" attacks and deflections. While slightly larger than the Kukishinden material, as a sword syllabus, the Kukishinden Ryu one is the better sword system. Hatsumi Sensei's Togakure Ryu Ninja Biken DVD is also fairly good, as it shows the basic form for a range of the kata (or, at least, versions of them, there are other versions that are also taught), but it's incomplete. Honestly, if you're wanting to get good at sword in the Bujinkan, I'd look to the Kukishinden Ryu Happo Biken Kenpo kata, and look to the strategies taught there. The big catch is finding someone who can teach it to you properly, without going off into personal interpretation that may or may not be viable, or safe to actually use.
Now, that's more of a long-winded post!