OP there was a select few who were negative on Walton but you're extremely over exaggerating that.
I'll be honest. I did have Scarlett higher than Walton but that was prior to their final seasons of high school football. Scarlett had more of a track record before going into their final seasons. I put Walton over him as the season progressed. Walton is just more polished and more complete. I have seen both live, no bias. Although I will not deny that Scarlett has incredible straight line speed, at the same time he's not very agile.
Dexter was the one I was really more upset about losing due to his incredible versatility that I liked. Cause he could have been used on special teams too. He has what I consider a wild card ceiling. He could have been ridiculously good but he's so injury prone that it could potentially hold him back. Something that 2017 RB commit Robert Burns has.(For anyone who doesn't know, yes.... Robert Burns is injury prone.)
I speak with Larry Blustein often. Same sentiments I had about Walton and Scarlett. Walton is just the better prospect, that doesn't mean Scarlett is a slouch at all.
You don't need a freak athlete to have a great RB. Lot of people have that confused big time.
I had Walton and Scarlett on same level for readiness to play right away then Cronk and then Dex following behind. Cronk had the lowest ceiling of the 4 IMO, I liked Cronk more as a safety. In terms of ceiling, Scarlett is what you see is what you get... Which is not a bad thing at all. Walton and Dex had/have room to grow a bit more. Walton in the weight room and Dex a bit in the weight room and in terms of becoming more of a pure RB.
Walton in my eyes is the best one coming in to college. Can that change? Yes, but that will be decided on the field. I just view Walton as most complete skillset.
There is a lot more to a RB than just straight line speed.