My take. There needs to be 1 guy in charge period. This needs to be spelled out before the start. When I was cooking with Phil, he was in charge period. If you can't go into it with that set up, then you should not go into it. Just my opinion. Of course if there are 3 people then a vote for anything helps out a lot. No tie vote on what to do.
Of course the guy in charge needs to realise that he doesn't know everything and listens to his helpers, but the guy in charge has the final say.