I play a little bit of Unbreakable on the side also, and the only two things I'd like to see are:
for he EX Parry to have a much faster start up so you could parry string gaps, and the EX parry to either give a damage boost to the next immediate combo or deal damage since the extra hit from freezing the opponent could mess with damage scaling.
That'd make all the difference in the world, because not only would you get your quick 20% at your opponent's expense... it'd also stop them from using their string that's probably tied to an overall game plan.
Since the reward is much more than frame advantage, it can't be safe on whiff. That would not be fair to be able to build meter with whiffing the parry, and only have to worry about blocking/breaking throws because then there is no risk whatsoever and no reads to make. You'd just throw out the parry when you're not doing anything because, you could. I wouldn't mind the recovery being better, but the opponent should have the opportunity to deal damage to you if you guess wrong.
Oh and mkl's right, Kotal does get 50% from you if the parried move gives him enough advantage to be at least +10. (1,1,4 BnB). I think it's fair though because KK's not guaranteed any damage. A move with great recovery gives him only frame advantage to start his counter offense, or possibly throw which is closer to guaranteed damage if you don't count uncontestable Sun God Chokes after parries.
