I think Wilder stops him. I have trouble putting too much confidence in a fat guy. There is no excuse to being a fat world class athlete. Especially in this day and age with all the... uhm... "vitamins" they take. Wilder covers distance really well, he can stay far away from the chubster and launch bombs at range. His chubby little legs won't be able to close the gap well enough.
Oddly I think Wilder stops him after looking buffoonish for much of the fight. A couple of things about Wilder is he knows how to play the long game (no homo). He'll fight and wing his shots way from the outside as much as he can and doesn't want guys all that close to him. He knows how to play keep away, no matter how goofy he looks doing it.