Hello Bruce:
As you know, I have no love for GM Suh after my experience; however, I DO love the art and many of its practitioners. Hence, I will only tell the truth as I know it, regardless of my feelings for GM Suh's business practices.
#1. His son, Master Sung Jin Suh is one of the most accomplished martial artists I have ever known. He is the product of both GM Suh and his earlier training with GM Seo.
#2. I have personally seen the books GM Suh sometimes refers to; however, since they were written in Korean or Chinese, I could not ascertain the content other than that the drawings are martial art related.
#3. From disussions with GM Suh, so far the only material he teaches to the outside world is from book one. He had also said he would soon "open" book number two, but he was really concerned that this material would be stolen. I can understand this position, because I now see a lot of Kuk Sool material in schools that teach something else.
#4. I do NOT know from what source these books are, but I have seen some video reproductions of old 8mm film that depict Monks doing some of the forms we know in Kuk Sool; however, they seem to have lots more stuff after WE Kuk Sool practitioners are done with the form. This leads me to believe that there is some truth to the assumption that there may be six forms to each of our weapons and empty hand forms. I have also seen them perform MUCH more material like Rope techniques that we were not (yet???) shown. Perhaps we will never be shown more
For example. Most Kuk Sool people can perform Ssang Bang Hyung one and two, but the monk I saw perform these forms (as it was just one), kept on going and going like the energizer bunny. This leads me to believe that the form indeed has more sections to it. I can also tell you that Kicho hyung now has six parts, where it had only five parts when it was first introduced to us here in North America.
Last, the sword form I watched Sung Jin KJN practice in my dojang (we were VERY good friends and he felt perhaps comfortable enough to trust me watch him without trying to copy him. BTW, I still consider him my friend even though he is forbidden to talk to me) is incredibly complex with some very acrobatic and athletic content. For all intent and purposes, if I did not know he teaches Kuk Sool, I might have thought I was watching a Chinese Hyung. Yet, having some fifty plus years of experience in the arts, I can readily see it is NOT totally Chinese. It had a distinct flavor all of its own.
Well, that is about all I can tell you other than the fact that I do not believe the roots of these things will EVER be opened to the public. IMHO, Korean people are just as guarded today to protect their material as they ever were. It is US who want to know, and they simply don't care that we want to know. To them it is enough that THEY know. We just have to live with that, the same as people have to live with the fact that I will not disclose information that is important to ME. We simply have to abide by the privacy ideas of individuals. Me, I am happy enough to have learned as much as I have over the years