Dang, I have Carson in my dynasty league! Davis too, but I need to make room for rookies and such. Tough choices!
In all seriousness though, I think Davis earned it. He ran hard and his skillset really showed last year. He's fast, quick, and will lower his shoulders. And his hands are super soft catching in the flats. I like Davis, but I still really want to see what Carson can do with a big workload.
I'm sorry, but McKissic doesn't do anything for me, but I'd still take him over Prosise. Plus, I think they'll draft at least one RB, and I hope it's one with workhorse potential, like Guice, Penny, Ballage, Josh Adams, or Scarborough (he might be my favorite, due to draft value).
I'd be thrilled with Davis, Carson, and a potential rookie competing for a workhorse role. Honestly, I think Davis could even handle the 3rd down back role.