Originally Posted by achillesthegreat
Arguably - YES!
There is definitely a case to be made for him. He literally has no real weakness. He is primarily a ground fighter, given his BJJ background yet he rarely if ever gets outclassed standing up. He was outstriking GSP, and making Hughes look silly on the ground. I know this statement is waaaay overused in boxing and MMA, but it is true of Penn-----If he is truly motivated and really trains and gets into great shape, he could possibly be as "unbeatable" as you can get in this sport.