Legit tho why did Illidan stay behind on Argus. He's not imprisoning Sargeras. He doesn't have the power of the Pantheon. What the hell is he even doing there. Nothing about the end of Antorus made sense.
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Illidan can't do anything against Sargeras. He's a speck compared to the Pantheon even.
Maybe he doesn't trust the Pantheon, maybe he really thinks he can do something to Sargeras. Really it was just to shelf Illidan, the Pantheon and Sargeras all on the same shelf. They really don't go into details why he stayed.