or maybe part of the condition of him staying was that change had to be made. heads had to roll. part of the whole "its just business" thing.
I hear you - it is really weird right? It makes zero sense on the outside, which suggests that there is (or was) something else going on here. Maybe Rivera has his eye on someone with head coaching experience and linebackers was the only area he could put them. Who knows..maybe Belin did not want to put Luke at MLB and Rivera did.
they have to do something that shows they won't accept the way things were. there is a price to failure and these guys just paid it so rivera, chud, and mcd don't...and i wouldn't be surprised to see more tomorrow.
right now its very likely what we're seeing is window dressing.