My personality type is an introvert. There have been studies done by a branch of the State University of NY that most thru-hikers are introverts. Having said all that, I have also been on retreats where a team concept was employed, and have had a rewarding experience. I'm betting that is exactly what Warren is doing with the pre-hike team-building that goes on before the actual hike.
I'm hoping Warren will chime in here, but I'm also betting that if you asked the participants of his thru-hikes, they will tell you they had a unique life experience and made life-long friendships.
And finally, whether you carry a pack or not, walking the entire trail is an accomplishment that needs no qualification.