Not going on size. In my opinion Achane is pound for pound the toughest RB we have, and if a defender does not quickly wrap up Achane, not only do they have to contend with his insane speed, or crazy sudden moves, but getting a solid piece of him is extremely tough, as he will run through the piece of uniform, or slight hold of him.
Ashane is a superstar, but he has taken a lot of shots, and so far both years he has had injuries. He is far more then just a RB in my opinion (And seems the coaching staff may agree, because they are working hard on making him a receiver...Or so I read). With the type of back he is, 10 to 12 touches as a RB is far better then most RBs getting 20+. Achane is always at a point where he is about to break one, but it's far more important ito get Achane in space.
Move him around, in the backfield, as an extra receiver out of the backfield or even receiver for some plays, make defense think sbout what Miami might be doing with Achane.
I agree that Wright still has a lot to prove, but he did show some talent last year, let him take more of the pounding, while Achane becomes more of the Chess piece that you can use in many ways, to help you get passed a stingy defense that does not give up many yards or points. Miami needs Achane more in Dec and beyond, then early in the season, so let Wright, or whatever new RB they draft take the pounding early.