Actually, I think our LB depth is quite strong. We may not have a quality starter to line up beside ZT and Crowder, but with Spragan, Hodge, Moore (if he's ever healthy), Pope and maybe Glenn, our depth is quite solid.
These guys can all play in a pinch, and contribute on special teams. None of them can play extended periods of time as a quality starter, but good backups nonetheless. Too bad Moore has wasted his first couple of years in the shop...