I think the leader task must not be to tell the others what to do with their maps and resources in order to get a finished product. It must be something like a supervisor, someone who takes care about all the things that are being done, taking care about the difficult, the look of it all, the librety of creation sticking to a determinate context... It?s a hard task, involves lots of taste, patience and playing maps from other people. The leader (supervisor) should also stick the team (small or big) together, inform everyone about what beings done in each moment and to inform the individuals about the evolution of their inmediate "Map surrounding" (what?s happening before and after).
Some of these things can be performed by the members themselves but some others are better to be done by someone with experience, mapping taste and patience. Someone who is not, evidently, me.