Well I watched the clip. It didn't show me anything different I didn't already know. Maroney can break the outside run for big gains. That was 85% of his runs in the clips. He had maybe 3 or 4 inside runs total and at least 2 or 3 of them he gained no more than 5 yards. The only "inside run" he broke for a big gainer he had a hole the size of a truck to run through. And there was one inside run where he went forward 5 yards then got planted backwards 5 yards by the tacklers. Not exactly a powerful runner when going inside the tackles. If he gets into the second level he can overpower smallish cornerbacks, but any RB should be able to do that.
Maroney's a good back, he's just not a tough, decisive inside runner. Of course none of this clip shows when Maroney hesistates at the line and loses 2 or 3 yards instead of making his cut and going like say a Joseph Addai.
Well health is certainly a concern since Maroney split his time his entire college career in Minnesota and he has missed at least a few games each year so far. Why not draft another talented back to help carry the load and act as insurance policy? That will also keep him fresh for the playoffs and minimize his wear and tear.