For those curious, you can bring up to 30 allies, against the army of 50 enemies. Really, that number of allies is just excessive. It's only approached by Ike's and Katarina's DLCs, each allowing 20.
Hey, I just noticed that the SpotPass update actually concluded the Other team. Glad to see they actually did that properly, unlike in the Japanese version where they fucked it up so that you never automatically get them.