I don't actually have the game or guide yet because the local Best Buy does not do midnight releases, BUT I still notice that most of your companions are involved in major factions.

Arcade Gannon - Followers of the Apocalypse
Craig Boone - New California Republic
Veronica Santangelo - Brotherhood of Steel
Rose of Sharon Cassidy - Crimson Caravan
Raul Tejada - State of Utolbitha
Lily Bowen - ?
ED-E - Enclave
Rex- Kings

Now I'm thinking to myself, which of these companions would I take if I were going to join with Caesar's Legion or Mr. House? It seems odd Craig will shoot you if you go Roman, but there is no opposing companion of any sort.

Aren't most of them EX-whateverfaction?