If that's what he wants, that's not what he's getting. Unless this new bowling ball (5'8" and over 200#?) is a thumper inside, we still don't have that tough yardage back who can get yards that aren't there.
Kyren was a pleasant surprise last year; he can get low and find a crease but that's not the same as being big and strong enough to push a pile or simply truck somebody who's in the way when there's no room to make a cut.
McVay wants backs who are capable of doing all that his system asks; run the same plays the same ways, pass protect, catch out of the backfield. He apparently doesn't value having a tough yardage spcialist who is a thumper, a grinder.
Maybe, if he can be coached to wrap his short arms around a football, that's a role for Fiske.