WWE would never take a recognizable MMA Fighter into their show and push him without an exclusive contract.
WWE is all about the money, and i don't think they could get someone like Mayweather from MMA.
And still i don't like the idea of Crossovers between ProWrestling and MMA because, well...one is fixed, one is not....
i don't think how any of the two could benefit from a crossover, now if a MMA guy wants to quit fighting and join prowrestling for the money it would be an interesting sight as
i've always liked prowrestlers that use a more realistic still, UWFi was great.
And also it would be nice to see more prowrestlers crossover into MMA, but stuff a la Lesnar, where they actually dedicate themselves to the sport, and of course it would have to be someone young and not severely injured from a pro wrestling career.