3rd string of the positions I would consider switching aren't but there are athletes that could be suitable RB's in those positions.
Right now our 3rd and 4th string RB are walkons, and not the kind that have generated camp buzz for a possibility of starting.
Until we are back to having 3 scholarship RB's, I would think BYU would be better served having someone get PT as the 3rd RB, rather than not getting any where they are now if they are better athletes than our current options, just in case, knock on wood, we need more depth this year at RB.
If things were really desperate, I think Fonua gets pulled in over anyone I considered, but I am just looking for a serviceable 3rd that would see light action.
I can also concede that Cosper shouldn't be in the running, but I also didn't consider Jackson Kaufusi as he gets some PT now where he is, he would be on my desperation move list.