Major Ursa said
We could always just stay one small army.
:3
But if we were to divide, I think more characters prefer to stick to alignment related groups. Maybe.
I personally I am fine with either-or, but I will say, people tend to go alignment-similar with groups, but it lacks a sort of inner-tension/inner-heat as opposed to non-alignment-similar groups.
That is just MY opinion though, I know others have their own, and everyone likes different situations better then others. ^^