Or he could have not liked Gus and then once Gus left he suddenly was much more interested in working here again.
Without knowing anything about the situation, this is 100% plausible. I've left places and come back amicably because there was a person in management that I didn't see eye to eye with, but enough people there wanted me in there and I got invited back.
A someone random question and maybe @Zachary or @Nicole know the answer. I know it was announced Kevin was leaving. Did he actually eave and dod they hire a replacement? I feel like they never actually reached that point, yet another place where making him come back could have been easier.