<shrug> Maybe, maybe not - hard to prove. It's one attribute he uses very well along with his others which complete the package. I'd say it'd be far easier to make the argument that Wilder wouldn't be in the top 30 without his power.
Fury has shown not just he is a very fine boxer but he can vary his tactics superbly when he needs to. He dominated Wlad, clearly beat Wilder in the first fight , while not close to being fully fit, and then beat up Windmill in the second. By great choice and execution of tactics. Size is important but ain't everything !
Fury looked much taller than Wilder and Wlad when they were in the ring. The pair of them really struggled with his arm reach and height.
Wlad just fought the wrong fight and didn't have a plan b. Was too set in his ways after a decade of beating up guys who were shorter or less skilled behind his jab.