#1 Brock Lesnar
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While it is pretty much a sure thing that Brock Lesnar is heading to the UFC for a fight with current Heavyweight Champion Daniel Cormier, it'd be foolish to think that he's not coming back to WWE anytime soon, even if he does end up becoming the UFC's new Heavyweight Champion.
As we all know by now, WWE is set to move SmackDown Live to the Fox network, and they do want to stack the show with huge stars. Of course, someone like Lesnar wouldn't be on every single week, but just having him be a part of the brand would probably be a big deal.
Also, Lesnar has pretty much exclusively appeared on Raw since he returned to WWE back in 2012, so it'd be something new. Plus, it'd be a good way to get him away from Roman Reigns, who'll presumably stay on Raw for the foreseeable future.
So, to sum it up, when Lesnar returns, the best thing for WWE to do would be to have him switch brands and become the top guy on SmackDown Live.