I really think Watchman style of fighting(and costuming) is perfect for Batman. At the end of the day this is a movie. The fighting needs to look great on screen. Also they are limited by the suit.The thing is just too heavy and restricting to do the things in that Tony jaa video. But again I'm biased because the Watchmen fighting can be brutal and gorgeous without looking choreographed. Also while no one brought this up and is irrelevant. No group of guys is going to attack one man all at once. There is too high a risk of hurting the others and simply limiting your defense.