A lone woman walking into a group of guys, in my experience, can get all of the attention and even change the subject. Especially if she is considered attractive, personable or sexy. Also if are the guys in certain moods, or positions like being pair bonded, single, horny, or lonely, will she dominate.
I haven't seen this info that you present published, but it makes perfect sense, if exceptions are accounted for. Like taller, or more aggressive, or louder personalities are present. Factors such as familiarity and common bonds, common communication traits, previous social dynamic being introduced to a new group member or members, affect the direction of group conversation and outcome.
The kid that owns the ball, or the chick that controls the ball are often the directors of the group's path.
Group behavior is fascinating. There is lots of evidence that nudity in a group does break down and change existing dynamics, in a positive way. It is more evident if the players are coming from our dominate society into the nude grouping, or they have had lots of experience with nudity. Stuff that most of us picked up from experience, not reading the books.
Jbee