No, he did not fight any 6ft 7in guys as far as I know, only 6ft 3 or so guys. That is why I said Wilder is a "very heavy" favourite. But Beterbiev has the power to crack anyone's chin, so always has a chance, small as it might be.
If Beterbiev can prove he is more than a big punch aka cerebral in some way then I would honestly favor him. Wilder fights bums and that don't make you **** in boxing...other than Heavyweight Champ.