Mike Gamble is now Project Director at BioWare - What could he be in charge of?

Yeah, he was the lead writer.  That doesn't mean he decides the direction of the game alone. During a major project no single area is an island they need the input of different groups so they can make an informed and knowledgeable decision.  He doesn't go tell the animation department what crazy and impossible task he wants to write in the script.  He would talk to the lead animator and see what is possible and then write a script around that.  If anything the overall direction of a game wouldn't even be his decision to make, he would more then likely have been told the direction and the key points they want to hit and it was his responsibility to write that content within parameters given.

Groupthink is normally when there is a discouraging behavior that prevents alternative ideas to be added the discussion or people are not allowed to contribute.  I do agree groupthink was a problem, but that was because everyone over the years started to have similar ideas towards what should be done so there was no fresh ideas being presented which in my first post was to get the ideas and input from the other teams to make a better product.  If anything having him be the only person that determines the tone is more of a groupthink idea then going around and seeking input from different disciplines.