I've not got to book 3 yet, so all of this is new to me.
The point I was making is that there is always an exception to the rule. If you've got a Witch Hunter in the same team as a Nephilim, it might be difficult in justifying exactly why they are drinking buddies but its not impossible.
What I'm wondering is, whether the game will take a relatively lax view of affiliations and allow the players to construct whichever motley crew takes their individual fancies, or whether they will have to follow a more structured approach and have to justify alliances or perhaps not be allowed certain choices.