That is the advantage of meeting one on one. One cannot hide. It becomes rapidly apparent if one of you is not prepared. The conversation can be more direct since there is just two. Strong bonds will form. The disadvantage is that the weaknesses of the leader will not be countered by the multiple gifts of other men.
It seems to me that the answer may be a combination of both, meeting in groups with the leader also meeting one on one with the group members. What do you think? Why?