There will be plenty of names kicked around for Don Brown's replacement. If Addazio's track record means anything, he is likely going to hire either someone he knows or someone from within his network (meaning someone that coached with a Holtz, Davie, Meyer, or Pasqualoni). I don't see an obvious internal candidate to promote. Lempa is closer to retirement than promotion and doesn't have Brown's past success. I don't think Albert has done enough recruiting wise to earn rolling the dice with him as a first-time coordinator. Here are a few guys who will probably be mentioned right away.
Chuck Heater -- Heater was Addazio's Defensive Coordinator at Temple. I don't know if there was any bad blood or hurt feelings with Addazio not bringing Heater with him to BC. Since then Heater has done well as Marshall's DC. He's old, but consistent and coached at all levels. He knows Addazio and could probably transition easily. I don't know if he would have the same recruiting success as Brown nor do I know if he would keep the same scheme.
Scott Shafer -- Maryland just hired Shafer, so this might seem unlikely, but maybe Addazio can sell him on total autonomy at BC. At Maryland, D.J. Durkin will be the Head Coach and a defensive play caller. In the run up to the season finale, Addazio praised Shafer again and again. Maybe he can pry him away.
Kevin Cosgrove -- New Mexico's current Defensive Coordinator. I can see Addazio leaning on a Davie guy. BC can offer a raise. Cosgrove has a long track record but New Mexico's results weren't great this year.