You don't need to be a "really good takedown artist", you just need to be better at it than the other guys is as stopping takedowns. Seriously dude, go and try it. I've said this a hundred times in these threads that if you actually to and try this stuff you'll appreciate both sports more and find them more enjoyable to watch. Adding kicks and takedowns very drastically changes the way you punch, the way you stand, the way you balance, the way you defend punches etc etc. You can't just picture PBF or Toney in a boxing ring, give them smaller gloves and assume that they're going to do the same stuff in a cage that the do in that ring. There is no worse style of boxing for going into MMA than the Toney/PBF style. Someone like Mayorga who is more square and has more power is a much better style to morph into an MMA style than a style that depends on standing in the pocket turned to the side hiding behind a shoulder with your leg hanging out to be kicked or grabbed.
Not at this time. maybe if Floyd spent a good amount of time training in MMA he'd have a shot. The only shot he'd have to win now would be if BJ decided to stand up with him.....which Penn is smarter than that. He'd take him to the ground and submit him.
I know a bit about takedowns from wrestling in highschool. In two matches against 2 guys with six state titles between them I was taken down once and had one take down. One of these guys ended up a Big Ten Champ at the same weight I wrestled him. The other was a four year starter at a division one powerhouse... So at the highschool level I could hang on my feet. :good