7) Why Does Apocalypse Choose These Four Horsemen?
As Moira MacTaggert explains, whenever Apocalypse gets bored and decides to do a bit of global cleansing he always allies himself with four other mutants whom he imbues with extra powers. These lackeys naturally become his Four Horsemen. In this movie, he chooses Angel, Psylocke, Storm and Magneto. But why exactly does he pick these four out of every single mutant in the world?
Storm perhaps makes sense as she is the first person En Sabah Nur finds upon awakening – and she does have an awesome skillset, to be fair. Likewise, Magneto is his primary weapon in his plan to destroy the world. But what exactly do Angel and Psylocke have to offer him?
Director Bryan Singer has said he wanted to liken Apocalypse to a cult leader, with him indoctrinating the young and impressionable like Storm and Angel. That’s an interesting angle, though in the film itself there is no suitable explanation as for why these 4 are chosen.