User blog comment:EonDragonTwins/A Thought About Eris Morn's Class/@comment-24113846-20150128035052/@comment-25876510-20150129024139

But if it was a balanced Fireteam, 2 of each class, and all of them having separate subclasses, then it'd be impossible for Eris to be a Warlock. Toland the Shattered and Eriana-3 were both Warlocks, so...

Anyways, like we said, it's just our thought on it.