I remember arguing with several fans (back before the 2017 draft) who thought Fournette would be better than Zeke Elliott. That take didn't age so well.
My argument all along was that Zeke is far more than a runner. He's very good receiver (although Dallas doesn't maximize him in that area IMO) and an excellent blocker. Some don't realize how invaluable that last skill is to an offense.
Fournette always has been super talented as a pure runner. I have no doubt that in the right system he'd blow up. But he's never been all that good in the other areas todays RB's need to be proficient at.