I think it would be pretty darn hard for any NDSU coach to leave for a coordinator position at P5. I think just don't think the money package would ever equal what NDSU can give a head coach. Even though you would have an easier time landing a P5 job as a coordinator than NDSU coach, you are still losing control over your own situation and you'd have to really trust the HC.
In summary, if your goal was to be a P5 coach, I still think it would be hard to leave for a non-head coaching job.