Thank you for the history lesson, I appreciate a good read. However, none of what you have entered changes the impact of Slomanski's accomplishments. And, by the way, Slomanski was trained in Judo as well, beginning his training in 1946.
As far as the reasons for Kano creating Judo, there are actually several articles that were well researched and all sources documented. I have read them, and I agree that Kano had a significant impact on martial arts, but not so much in the way people trained, but more in the fact that he was the first person to use belts to help students maintain their interest in learning.
I also agree that the Gracies, less Helio and more his sons, had a tremendous impact on ground fighting. Helio was the first to experiment with a greater range of locks and submission moves then the standard moves. In other words, he went outside of established patterns to find his own truth. The results speak for themselves, and I would never deny the impact they had on the sport. They were not pioneers, but they certainly were innovators.
The impact that Slomanski had on Japanese Karate was for the creators of the styles to realize that techniques and training needed to change. Size was an issue, regardless of what they thought. Slomanski destroyed an entire belief system in two days. If you fail to see the impact that had on martial arts, then it is your loss. However, I for one feel that Hank Slomanski deserves recognition for what he did, and is indeed in a class with Helio Gracie, though perhaps not with Kano. But, that was never my point. My point is, he changed an entire systems belief in what worked. How many people can ever say that? Very few.