IMHO, nothing in the A-Wave could even hurt AM (not even the Galactus gun). Two heralds were holding off a blast from the Galactus gun long enough for people to evacuate a planet that was targeted by it.
It all comes down to Aegis and Tenebrous. Just how powerful are they in relation to a fed Galactus? T was giving Galactus hell but he took Galactus by surprise and it looked like Galactus was about to eat (hence not at normal power levels). If either of those two are Galactus tier, then SCW AM loses. IMHO, they aren't so he wins.