I kind of enjoy the thought that it doesn't have to be done in one fell swoop; that two (or more!) "Matts" can combine anytime they're in the magic circle and the button gets pushed.

I'm not sure if I'd prefer a Metroid-style "first one's a doozy but it helps with the next" scenario, here, or if some of the alters agree to combine because anything that gives them a better chance is better than combining with... (guilt? base-Matt? grandstander?) again. Righteousness and rage would be frightening. (Both would be Daredevil, by preference. Ouch.)