That's just the thing though. I don't think Dwyer, Mills, Marshall, Howard, Mason, etc. are fullbacks. They could all play RB in a standard offense and do great. I think a FB could do fine getting our power yardage, but our offense is at its best when our B-back is not only powerful, but explosive. We saw what happened when we put an actual FB (Patrick Skov) back there.
But yeah. DL recruiting has killed us for 10 years. We've actually done pretty well with DBs and okay at LBs, but not at DL. Check out this list of 4* DL we have signed since 2008:
JC Lanier
Anthony Williams
Denzel McCoy
Francis Kallon
Jordan Woods
We beat out teams like Alabama, Auburn, FSU, Clemson, UGA, etc. for every one of those guys. It's pretty ridiculous that every single one of them didn't work out for various reasons. That's poor development/evaluation I guess, but it's also really, really ööööty luck.