Uh what? All of those guys you named have pretty extensive Bjj training. Bas Rutten even talked about using Bjj in street fights on Inside MMA once. Edgar has a Black Belt in Bjj. Cormier has a Brown belt in it.
To be honest, I did a quick google search and they were who showed up. The ones I know are couture, lesnar, Dan Henderson, Robbie Lawler. Cormier, I've never heard of him training in BJJ. I could be easily be wrong though on him