I was just thinking about this today as well. this is 3 completely different styles. you have the slasher in Dex, the Tough runner in Walton and complete back in Scarlett. Even though i hate to compare anyone to NFL players the style i will compare
Dex = Lesean Mccoy
Mccoy can stop on a dime which i havent seen from Dex but he can burn
Scarlett = Marshawn Lynch
Lynch is way tougher of course but he gets those yards and is a patient runner
Walton = Frank Gore
he may not be the size of Gore but they run for those tough yards and break from time to time.
This of course is MY HIGHLY Opinion. i would like to see how other compare them.
If he can't stop and start on a dime, you can't compare him to Shady.
If he isn't extremely tough and powerful, you can't compare him to Lynch.
And if he isn't almost the most natural running back ever, then he and Gore don't belong in the same sentence.
Those are why I agree that people need to be very careful in comparing players to pros. Maybe they all end up great, but why even try now?