Singer should have used X-Knight over Kinberg!
I don't come cheap.
but really, each of the horsemen should have had something that Apo preys upon. They sort of alluded to it but never really developed the characters fully. again, aside from Magneto.
Storm feels rejection and betrayed by the people she tries to help, as outlined in my scenario above.
For Angel, it's vanity. His beautiful wings have been torn. The humans lock him up in a cage to fight like an animal. But Apo can give him his wings back, better, stronger than before. he can free Angel from the cage the humans put him in and allow him to ascend as an Archangel.
For Psylocke, it's envy. She feels inadequate compared to other telepaths and psychics. But Apo shows her she's powerful in her own right - she can do things with her mind that the other telepaths can't.
For Magneto, it's rage and anger - for obvious reasons.
Only Magneto's motivations for joining were developed to any extent.
with Angel and Psylocke, it's sort of hinted it but not really explored.
and with Storm, it's practically non existent.