I think I would too. Johnson historically hasn't done well against fighters who took it to him and gave him a taste of his own medicine - ie: Merqui Sosa, Omar Sheika. I think the Prince might start off trying to box Johnson and struggle early on; but then he'd make up his mind to just let his hands go, and he'd overpower Johnson from thereon in and get the decision.
Williams was past his prime when he fought Sosa and Sheika he wouldnt have had a whole lot of problems with them especially Sheika during his reign. Williams ud 116-112 or something like that.