Does anyone know...

...what happens if you choose not to make Doran and Christian cooperate? I saw some screenshots of the dozen having a meeting to decide on killing Christian but I'm not sure if it's because of that specific choice, or if I have to also be on the hidden Christian suspicions path to trigger it.
And most of all, I'm wondering what happens in the ending, I mean, obviously it's not a good idea but I wonder what consequences it has, especially if we decide to take all the other improvements for the good ending besides this one