Sucks to lose him but if it's true he wasn't big on the recruiting trail this shouldn't hurt too much in terms of keeping commits, recruits, and current players. Hopefully RE has someone in mind for OL and I'd imagine he knows how important,and weak, that position is. I trust he'll find someone better.
This shows two things to me. RL and Grimes we're not here long term and never intended to be. I think RE is looking for some continuity on staff so he'll look for someone similar to Dunn in terms of them not being one and done type coaches. Secondly, he's looking for coaches who will give their all in recruiting. I think he knows how weak this team was when he came in and that recruiting is the most important aspect at this junction.
All we can do is hope he makes a good hire because Grimes did a heck of a job with the OL. Gotta hope we keep that forward momentum.