In the past I've leaned towards BJ Penn, given that he's super-smart, knows BJJ, striking, and multiple weight-classes incredibly well, and doesn't give a flying **** who he pisses off (his book is so awesome). I know he did guest commentary once in the past but it would be cool to see him back. I'm pretty sure he could be the GOAT color commentator if he felt like it. Another one would be Ed O'Neill... And of course Jim Ross, who from what I hear was unjustly removed from WWE recently, and loves the fight game. How about you?