Now that I've heard a couple responses, I should probably give my personal opinion.
I don't know the issues with Gailey and O'Brien.
I have heard that players had divided loyalties to CG and BOB.
Who knows?
In short, I think BOB should be back next season. We have all heard how Gailey has changed some of BOB's play calls to his own desired play on several occasions this season. Gailey is the head coach. That means during games he should oversee, direct traffic, and talk at the half. Chan, Let your coaches do their own coaching. That's why they're there, to coach their positions. In BOB's case, call the plays.
BOB should be retained on this staff!