I came across some old books on unarmed combat techniques for servicemen that I thought were quite interesting in some places. What struck me was that quite a few of the illustrations and photos of various techniques showed positions that looked very similar to those in Kata. This got me wondering if practical kata application was being incorporated in US army unarmed combat training (which I suspect may not have been the case) or is it that with the same problem, same goal and human physiology being the pretty much same for everybody, the same practical answers become apparent.
So I am not sayig that there is a link between these images and kata per se, just that it seems like kata provides answers to practical problems, the US Army found practical answers to practical problems, and that those answers were remarkably similar.
Anyway, not really putting a theory across, just thought it was an interetsing parallel.
Arm bar similar to Pinan Yodan, Godan, Kushanku.
This looks very Naihanchi. This is actually listed as a ju jitsu technique but is still an example of another martial art having the same solution to a similar problem
Double block similar to that in Chinto.
The turn, soto uke and kick found in the pinan katas and Kushanku.
I have seen something loosely resembling this in a kata, but cannot remeber which one. Maybe Chinto but I think I have seen it somewhere else without the spin.
Similar to part of the opening move of Kushanku. The following move is to grab the neck and force it downwards with a knee thrown in for good measure.
I thought this looked very similar to the neck crank in the Bubushi.