Although smart, Gorillas/Apes aren't geniuses. In a fight, i'm pretty sure their instincts will take over and their style will consist of... bite, bite, smash, throw, bash, charge, strangle, shake, smash some more. I can't imagine one scratching it's head mid fight and being like... hmmm, this guy's too big, maybe i'll use that billboard as a boomerang! He'll never see that coming!