Gregg,
Your comments are directly on point. Personality conflicts can definitely impede progress and stifle creativity of the group. One strategy for dealing with this is to set ground rules for the meetings. If the rule states that nobody can speak for more than 5 minutes at a time or that every point needs a counterpoint by another team member before the original speaker presents another idea, it is harder for one person to monopolize the meeting.
Thanks for the thoughtful submission.
Jamie