If this fight does actually get made I guarantee that Joyce belts out Dubois inside four or five rounds. Probably sooner.
IMO Dubois is all smoke & mirrors. His best win IMO is still the decision over "Kingpin" Johnson. Since then, he's KO'd two African tomato cans, a tub of goo in Gorman & an opponent from the heavyweight hotbed of Japan.
The official stats say that Dubois had "about" 75 amateur fights but I've got some friends in the UK that say that the real number is likely quite a bit less than that. And even if he did manage to fight anywhere near that many times, the vast majority of those bouts were for schoolboy titles, junior ABAs & European youth titles. He only had a few bouts vs senior opposition.
Conversely, Joyce fought nothing but grown men throughout his amateur career. And he won the senior ABAs, the Commonwealth Games, the European Games as well as other titles en route to the silver medal in 2016 Olympic
Games. With many saying that he was unlucky not to win the gold.
Add to that his experience in the World Series of Boxing where he had 16 five-round bouts with some of the best amateur heavyweights in the world. As for Joyce's pro career, it may be only ten fights deep but his level of opposition has been higher than that of Dubois. With opponents like Ian Lewison, Lenroy Thomas, Bermane Stiverne & Alexander Ustinov probably being better than anyone that Dubois has fought. And Bryant Jennings unquestionably being so.
Sure, Joe may look slow but throughout his career folks said the same thing about George Foreman & he seems to have done OK as I recall.
I'm actually surprised that so many are picking Dubois in this proposed match-up but that's OK. Warren is good at making his fighters look better than they are via favorable match-ups when they haven't got the goods & that's what he's done with Dubois IMO.
Joe Joyce KO5 Daniel Dubois.