Paul is a fast-rising prospect whose recruitment BLEW up in the last month. He's the kind of back that you take if you can get him.
Another reason is if you have another RB on the roster in 2022, it gives you a ton of versatility with Tyree.
Even if Tyree doesn't see time working out of the slot, I am of the opinion that four RBs is too few given the nature of the position. One injury and boom you're dangerously thin at the position.
Lot of reasons to try and add a back like Paul.