TSR, coins (original), playa (original), IAP (original), so nobody else gets in the way of my writing.
EDIT: Not claiming that I'm the best writer on the site, or even that I'm a better writer than most on here. It's just that too many cooks will most likely spoil the broth. My ideas are my ideas and I feel like trying to get somebody else to pitch in would only dilute the story. I will admit that it's a pride thing as well and I just want to feel like making a storygame is something I can do alone. Too many people with no ideas or too lazy to learn scripting expect a co-author to do everything for them. Even if they manage to find someone like that, it's in their best interest not to rely on them too much in case they quit/disappear.
That's not to say that storygames with co-authors can't work, just maybe five people is too many.
EDIT EDIT: Just re-read and saw that the question is more about picking a team that you would like to see work on a storygame rather than a team to work with yourself. I still stand by what I said and think that five authors (yes five, not six, because storygames only allow for one main author and up to four co-authors) is too many. All the top authors can write excellent storygames themselves by themselves, but I'm not so sure about such a big collaboration. Each of them would probably want to take the story in a different direction.
That said, I would love to see a smaller team of just EndMaster and BerkaZerka work together, just to see if EndMaster's storytelling and characterisation would work with some crazy scripting by Berka. Both of them have worked on storygames that are huge in scope too, so it could potentially end up quite a big storygame.