Please forgive if this has already been mentioned, sometimes it's difficult to follow all of the threads.
I find it very interesting / odd that Soresu doesn't have the "Defensive Training" talent. It looks like all of the other forms (excepting Ataru, which isn't defensive anything) have it somewhere in their tree. I know Soresu has the Defensive Stances and Defensive Circle, but it seems odd that Defensive Training is missing.
I'm not sure if it's a balance issue or it just had to be dropped from the tree due to room. The thing that distinguishes Defensive Training from the others in Soresu is the fact that it provides a passive benefit, whereas you have to activate with either an action (Circle) or move + strain (Stance) the talents in Soresu.