I use big man JJ a lot, though because of it my bottom game is not on par with my top game (I'm working on it! lol) I've seen a lot of smaller guys with a SICK bottom game though their top game is horrid. I find my big man style works really well, I'm quick enough to hang with the advanced smaller guys and strong enough to hang with the bigger advanced guys. My only down fall is my legs are to short to be sneaky with triangles and armbars, but my scissor sweep and flower are strong because of my big legs. So it all depends on the person. I thought about losing some weight and getting a little smaller, but I would have to relearn my entire game.