At age 37, and no MMA experience in the pros, you'd think Samoa Joe would be the unlikeliest name on this list, but at least until he signed with the WWE, he was a possibility, and frankly, depending on how things go with World Wrestling Entertainment, he could still be an option. It's been well known for a while that Joe trains in various disciplines and counts the likes of Tito Ortiz among his partners, so there's absolutely no reason he couldn't make the jump. In fact, he probably would have an easier transition to the MMA game than CM Punk, for example - but for now, Joe is focused on the WWE, the only notable territory in pro wrestling that he hasn't already left his mark on at this point.