The conversation being six months in the past is irrelevant - this is the only piece of evidence we have, so there's no reason to change the conclusion.

You're asking people who, in their majority, aren't neurophysiologists, and so cannot possibly do these things. We do not even know what set of recognized mental conditions this person has.

OTOH, I would probably say that priority #1 would be to find someone - possibly the girlfriend - to keep track of Zebra's condition, since spacing out sounds very dangerous.