Though it may just seem that he literally doesn't own the game, I have played with him on multiple occasions with his screen name CrueJackson17. I tried to see if there were literally any other emails that were registered for a Mojang account, there weren't that weren't mine. The only email left doesn't have the game, but has the payment info. Perhaps he was playing on some other persons account? I tried buying the game again and knew for sure when his username was already taken that his account does, in fact, exist. So now there's the question which is: Why does minecraft.net say he does not own the game?