I brought this very thing up several years ago and was lucky to make it out of the room in one piece!
Makes no sense at all to me that you can have 3 troops/packs meeting within 1 mile of each other, all struggling to draw more than a hand full of members to a meeting.
I agree, that's certainly not a conversation that should involve all members of the troop. I would think Key 3 and maybe 1-3 more if there are long term committee members with positions who know all the parties involved would be sufficient and appropriate.
But, it doesn't sound like the OP actually engaged in any significant dialog with the CC on the issue, so it's hard to know if the CC saying "lets discuss it with everyone" meant literally everyone or if he/she meant it the way my CC would have with just the core Committee members.