Seriously though, this shouldn't even be up for consideration. We're used to Jon just steamrolling his opponents, but with his last three fights he had to overcome come some sort of adversity to win. With Vitor he was in a tight submission, he broke his toe against Sonnen (even though it didn't really matter), and he had a war with Gustafsson. I think that showed us a lot about him.
I don't know why you'd want to put somebody else on the cover right now if you're going by body of work. I'm not saying GSP or Cain would be bad choices or anything, but Jones is the top dog until someone knocks him off.
It will be a big surprise if it's not Jon Jones, but they might stick a few fighters on the cover for all we know. It won't surprise me to see Jones along with a combo of GSP, Cain, or even Ronda Rousey.
That being said, Jon Jones by himself is still a pretty good bet.
I think it should be and will be Jon "Bones" Jones! Anderson Silva was on the UFC Undisputed 3 cover when it should of been Jon Jones. Anderson lost recently, while Jon made history recently