So I train MMA, and my stand up instructor is 6'2" and about 300 pounds. He rolls with us when we do BJJ. He's alright, doesn't have a belt ranking in BJJ or anything, and mainly relies on his size to lay on you until he gets something. So how do I grapple against him? What are strategies you use against big men? I can barely get my ankles to touch when he's in my guard. It's ridiculous. The only thing I've ever submitted him with is a keylock when I somehow muscled him into side control and I've seen someone get an armbar on him from guard. I'm 160 pounds at 5'8" so you can imagine the size difference. So wtf do I do?