Brock is a marginal NFL prospect. I expect him to have more success than any before, but I'd rather him as a CFL star rather than an NFL backup.
That said, our REAL NFL prospect is Marcus Coker. A legitimate prototypical RB, I see Coker flourishing at SBU in our run-first offense, garnishing the looks of several NFL programs in the draft.
A breakout by Adrian Coxson would also qualify him for NFL consideration.
For the NFL, it's all about athleticism and size. FCS players don't lack skill, they lack some of the prototypical builds seen at the higher level.