I think DJ's one flaw in his game is fumbles. Some guys get better, some don't.
but if you want to compare, it should be holistic.
LeVeon Bell has had injuries, including a knee surgery, and, he has a substance abuse suspension -- so he is one failed/missed test away from a season (IIRC) suspension.
Elliot also has had a suspension, and plays for an enabling owner. While IMO the best runner of all referenced, is far and away the weakest receiver.
Gurley has had an ACL -- and his second NFL season was one where something wasn't right - health, head, offense.... who knows.
again, this isn't a 'pay the DJ whatever he asks for" -- but the comps all come with risks of their own.