I've watched whole game films of Chaney. He played in a wishbone offense where he wasn't featured and wasn't even on the field for large stretches. You don't realize how much of a projection and adjustment it is for him going from that offense on a bad HS team to ACC football.
He has good size and he hits the hole hard with acceleration. Other than that his traits don't stand out on film. He doesn't have a lot of wiggle or shake to make guys miss. His contact balance is decent but not close to as good as Crowley. His pad level is high and he only shrugs off weaker arm tackles. Then you throw in the intangible factors like how that wishbone offense defined holes for him and he struggles with mental processing and sifting through traffic. Or how he has limited experience as a receiver and pass protector And he's injured now. So right now he's a bigger back who can run fast through the hole when it's defined but doesn't have wiggle or overwhelming power, doesn't have 3rd down ability, wasn't used in the return game. That makes him an even more limited poor man's Fournette.
But yeah his recruit rank, offer list, testing numbers and performances in shorts are all elite. That's great and all but I evaluate football players not just athletes. The athleticism is nice and indicates that he belongs in Power 5 football but it doesn't guarantee anything beyond that. His development as a football player will determine that.
Crowley is bigger, more powerful, better in the pass game and has the nuances for the position having executed a variety of run schemes in HS where he showed he can read his blocks and make sound decisions running in traffic and on the perimeter. Chaney might have more theoretical long-term upside but that's not a high probability outcome, certainly not in the near future.
Since you mentioned Knighton, the difference between Knighton and Chaney is that the former is more explosive and has more juice with the ball. He's shown an aptitude as a receiver and returner. So even if he has the same adjustment curve as a runner he can at least get the ball in space where he's the most dynamic guy on the team.
The only thing that's egregious is that you and others insist on arguing with me time and time again when I analyze the film in greater detail and have a track record of successful evaluations. Like we can keep going down this road over and over again but eventually you're gonna learn that I'm not making **** up and my thought process is better than the uninformed consensus.