Hard to say. All have a legit shot at it. Borom could be starting on the OL within a year. Herbert I would say has the least chance, but he could be a Monty replacement soon as well. Newsome won’t see as much time on the field being in the slot, but will make some plays. Graham could be the starting NCB in a year, and Tonga possibly spelling Goldman on the DL, even though it’s not a play making position.
If they all fill their role, I can’t say any is more important or better than any other. For this coming season though, I’d put my money on Dazz. Best chance to do something from day 1.