#4 Proven formula
CM Punk has proven that you can go over from the WWE to the UFC. Meanwhile, in a world of role reversals, there have been several fighters to make the trek over to sports entertainment in order to try their hand at something new. Dan Severn and Ken Shamrock are two of the bigger names that come to mind, but there's another that we need to talk about too.
Brock Lesnar. Now whilst many will rather obviously point out that he was a wrestler before a fighter, he was a completely different animal when he came back in 2012. His entire character had changed and morphed into this absolute unit who was more interested in hurting people than anything else. So really, it's a proven success story waiting to happen.
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This final one may be a tad obvious, but we don't care.