User blog comment:Master Sima Yi/Assassinews 03-03-'13 — Assassin's Creed IV: Black Flag trailer and screenshots/@comment-4928711-20130313180958/@comment-1153722-20130313181641

The 'Colonial Assassin Brotherhood' was the Brotherhood in the British American colonies. The Assassins in Louisiana had their own Mentor, and so did the one in Saint-Domingue.

Since Edward will be primarily going around Cuba, Jamaica and the Bahamas, he won't be a part of the Colonial Brotherhood.