Board Thread:Episodic and Issue Discussion/@comment-4928331-20130305235618/@comment-4928331-20130308104428

Yeah, he left the Team after her death, and his current whereabouts have not been revealed, ergo he is missing. They're not really incompatible :P

I think it's pretty clear whatever happens in the game will cause Aqualad and Tempest to leave, and presumably Lagoon Boy to join and Ocean Master to be de-lighted.