Once you made Aodhán's reasoning clear, he was fine - I think his exact words were "Ballsy move!"
Mike's really good about separating character from personal, and is prone to playing unorthodox characters that take some work to meld with the party. And he's a stickler for playing his characters according to the personality he's built for them, so he's all good with working with the personalities of the other group members as well. But his ultimate goal is to work his characters in and have them be part of the group.
And I'm growing more and more comfortable with the idea of a little intra-group squabbling as well. As long as the players recognize it's part of the story, you guys can communicate OOC so that you don't take it down a path that leads to hard feelings and breaking up the party.
It adds a little drama, I think.