lol @ anyone saying studying tape is bad.
you people do realize these things don't alter the fighter completely, right? you see someone dropping their right hand when throwing a left hook, you're not going to dedicate your entire camp to throwing a counter and dismiss everything else. when they don't drop their hand, you aren't going to panic because suddenly you have nothing else. it was just an opportunity you prepared for.
guys who claim they don't prepare for a specific opponent are living in the past. a well rounder game and ability to fight everywhere is always the main focus, but knowing your opponent's habits is what gives you an extra edge. it doesn't limit you in any way.
the best example i can think of is GSP vs penn 2. GSP and his camp realized that BJ trains a lot like a boxer, so their plan was to lean on him and tire out his arms. they also knew BJ is awesome at standing back up, so any time GSP stood up in the guard, he controlled at least one of BJ's legs and lifted it towards his head the second BJ tried to move. now, do you think that specific technique would've messed with georges' head if BJ didn't try it?