Bob Bryar is a great drummer, and he surely should be missed. But I personally think that we should all respect the fact that MCR is keeping tight-lipped about his reason for leaving. They could easily come out directly and tell us why he left, but that would most likely end up hurting both Bob's and MCR's clean reputation as good, decent human beings.
I think they're doing the right thing as to keeping their lives as personal as possible. They're showing alot of respect to Bob, and I think we all should give that same respect back to MCR.
But that's only my thoughts on the situation.