He only said next game. If I remember well, Esperion next game is against one of the toughest opponent of the league. That wouldn't do a favor to Aoi while he realizes his limits.
So maybe he won't drop him in Esperion B, but just ask him to watch the game to see everything and continue to learn.
I don't really see Aoi dropped in B now, he clearly showed everyone that he can play with A, even if he's still one of their weakest player.