I think everybody with a pair of eyeballs is excited about Scarborough.
The real test will be: How is his consistency? How does he hold up to an SEC schedule? At what stage is his mental toughness? Even with a split-back system he will still need these traits to be successful. I think his versatility and the level of play and competition in high-school has allowed him to develop quicker than Derrick Henry. He's used to catching a ball out of the backfield, he already seems to have a little experience picking up blitzes...heck, he'd even line up out wide.
We can all speculate, but it's never clear until you reach the meat of the schedule, like Arkansas or Tennessee. I'd wager he does pretty good for himself.