Thematically speaking that is an interesting way to look at it.
I think that their goal and resolve has a lot to do with their combat strength versus Zero though. When they're in doubt, whether its due to Copy X being a little off the note, or when Copy X has been killed and they're in charge now, it may pose enough doubt in their actions to effect their power in battle.
Similarly, when fighting against Omega along with Zero, they showed remarkable strength. They knew exactly the right path to take then. Without their help, Zero would have surely died.