One of the players suggested that the team leader should be able to pick the team and not include himself in it, so we decided to try that for one game. We were playing with 10 people. As we tried this out, I got the role of Merlin and immediately knew who all (except mordred) the bad guys were. The first team that the team leader picked was all good people and we passed the first quest. The next quest leader was on his left, and he was in the first quest, so logically we told him to pick that same team and add one person. And after we added that person, he was also good and we passed the quest. However, now the next quest leader was a bad guy, but because we are allowed to pick the team without the leader in it, we basically forced the bad guy to choose the previously same successful team without the quest leader (who was bad), because after all, if the bad guy didn't, then obviously that guy is bad or else why would they not pick the team that had no troubles? This strategy ended up in a 3-0 match, and the assassin didn't guess me correctly. So the good guys won quickly and easily.
We all thought that this rule seemed kinda weird, so I wanted to ask you guys who played more than us to explain this to me. Should the quest leader have to include himself? because if not, than the game could happen like what happened before.