You know what's interesting about this scenario? I asked (back when I was a co-coach for a high school) what to do if a team has co-coaches (since the conference I coached in had at least 2 schools with that situation). The executive director of the state association (now retired) flat out said only the head coach. I asked for a definition. ONLY THE HEAD COACH! He said, while his face turning red from anger. I was like if a team has 2 head coaches (duh, what does co-coach mean????), he said for me to shut up and remember it's the head coach only. So, if I were to ask the question of the current executive director, I'll be the same thing would happen. I don't think the national rules committee has actually taken the time to define a co-coach situation. I think (personally) they don't want to deal with it, because of the ivory tower theory (don't ask me to explain that one!!!).