Everyone I roll with regardless of rank or size say I'm explosive as hell. I just have really powerful hips which help a ton in sweeps and also getting out of a bad situations. That and my balance / control while in a dominant position is really good.
I used to be terrible off my back but have worked almost 90% on that in the last couple months, and it's coming along rather nicely.
"Speed plus mass equals destruction" - Brock Lesnar