absolutely agree with Penn, Fedor, GSP. I'd also throw Aldo, and Anderson Silva on that list. Definitely Jon Jones. Back in the day Frank Shamrock for sure, Bas Rutten. A little after that I'm thinking Big Nog, Josh Barnett. Andre Arlovski has a terrible chin, but a very diverse skillset. If Shogun had any takedown defense whatsoever I'd add him to the list. Similar is Nick Diaz- great standup, great groundgame, not much wrestling. Matt Hughes has great wrestling and submissions, not the best standup. Chris Lytle was very well rounded as well.