he seems to have a smaller top skull, but a normal or slightly larger chin. I dont think his skull is suited to take big punches, he will have to keep his temples protected. I think Drained Eubank KO's him in 5rounds.
Maybe a forehead implant next? https://www.boxen1.com/wp-content/uploads/2021/12/BENN-VS.-ALGIERI--1024x683.jpeg
It's that ridiculous neck tattoo, in the wrong light it makes it look like his chin is about 8 inches tall.