Gibbs is only 10lbs heavier and 1" taller, not a ton of difference although ideally 205 - 215 is what I like in a back that plays with finesse and catches the ball out of the backfield.Achane is much smaller which to me doesn't work as well. Minimum a RB should be is 200 lbs
The thing about Achane is he has great balance and runs more physically than his size would suggest, probably more physically than Gibbs. Achane runs like a bigger back and Gibbs runs like a speedster. I like Gibbs and am not suggesting one over the other but if 1 falls and it was Achane which is the more likely, I may be tempted. Good returner too