I think it depends on their opponents, in the Bivol fight, I would say that Bivol is great but for sure he is not yet exposed to casual boxing fans as it is the 147 lbs who is the biggest draw followed by Heavyweight division.
So yeah it's completely different division and there's not need to compare in my opinion. But we all know that Canelo get REKT by Bivol, hehehe.
That was a bad defeat by Canelo, because after he won the undisputed fight, he tried to climb but lose via unanimous decision.
He wants a rematch right away, but good thing it didn't happen because I'm afraid he will experience another lose.
More time to study Bivol is better, I'm sure he'll find a way to even their rivalry, if we called it that way.
Now's is the question whether Fulton has that ability to believed in himself to beat the Monster in his hometown.
We will know that once he is already in the ring because that's the only time he will feel how strong the punches of Inoue are.