"Oh. Right. They're not there." It is probably a good idea to keep them on until Zack gets some more control of his life back home. "That is probably a bad thing in the short term."

Short term, because as mentioned, if Zack gets his life under control then he won't need them. The question then becomes what happens when Zack is no longer compatible with Antillioch.

That is a problem for future Alec, though. Soon in the future Alec as opposed to older Alec.