Stacking Skin Skill bonuses

[zoso]

Been playing through the game using the Bruiser Brigade team (Wolverine, Colossus, Juggernaut and Rouge) for the EP bonus, and wanted to apply the Age of Apocalypse Skin bonus in Act 3 but it won't activate i just get the Bruiser Brigade bonus. If i change any character then i get the AoA bonus.

So is it possible to stack, or would i need to change my team in order to get the AoA Bonus?