I think if you are going to have one RB and give him 90% of the carries, then Zeke is your guy. Because he can obviously handle it and he is tough. But I think you lose that big play ability with him.
Personally, I would like a more diverse RB by committee like how SF does it. 3 guys that have different skills with more home run ability. Using 3rd and 4th round picks to keep backs coming through the system. You could do this and spend under 10 M per year on the position total. All your eggs aren't in one guy. It solves the issue for suspension, injury, and diversity of skills. And it gives you the ability to trade guys that do really well here that want big money.
That is the system I would employ here. I would spend the money on the Olne, not the back. Low spending of draft capital and low spending of salary capital with the ability to trade RB's that come through the system.