The Co Coaching thing already happens. Nathan Buckley was basically head coach with Mick and the same with Leon Cameron under Kevin Sheedy.
If there were to be two coaches it would be a main coach that gets all the limelight (Bomber) and another guy that just does all the actually training and match day stuff (Bolton).
Cameron and Sheedy yes, and it was Williams for the first year doing the real coaching, but Buckley was far from basically head coach under Mick. It's common knowledge that Mick kept Bucks at an arms length and a half after the Kirribilli agreement was made.
I can't see us going down that path though. We'll need a senior guy to be that figure head and with Thompson on the outs as suspected there's no one else available to take that position.