That's not a criticism of Luarinaitis, we seriously need depth at linebacker. Let me put it this way. Greg Robinson. People think he's being eased into the system too slowly, it's going to be even worse with the center (okay, I'm went back to the offensive line again) and middle linebacker.
If we could get someone that we could work in slowly at all three positions, we'd be a lot better than, Dunbar at MLB as a backup, which puts who at Sam? Seriously, think about it. We have pretty decent depth at almost every position except center and linebacker.