"Time's fluid here. People have gone home, come back further along in their timeline or further back in it. No idea how or why but-" He shrugs. "Everything's fluid and relative and trying to pin any of it down is asking for a migraine."

Which isn't to say he hasn't- he's just been careful to not focus on that for too long since, well. Migraine. He gets enough of those on his own without courting them with impossible science.