I'd agree he'd be Wlad's stiffest challenge in ages. If he can somehow mitigate Wlads size/reach advantage enough to detonate one of those bombs............ I'd give him somewhat better than a puncher's chance to win.
Arreola buzzed him good a couple of times. Wlad hits about twice as hard and his punches are more accurate and sharper. Not to meantion his jab, reach, speed... Bermane is getting stopped mid rounds.