That's fair, but I don't know that other manager's have had a career arc like his though.
Most managers who head somewhere else to manage get to that other place through being fired or not having their contract renewed for performance reasons at their last job. Hinch, OTOH, was fired for his place in the scandal and there's zero doubt that had the scandal not happened, he'd still be managing there and, for all we know, would have been there until retirement (similar to Bobby Cox). And that didn't happen. I imagine it's a source of regret and shame for him, so it's not surprising that he may be wistful of different times when he goes back to Houston.
Put another way, the guy lost his dream job, and one he'll never be able to get back. It may not happen like that in baseball often, but it's not that uncommon a story in everyday life. But that doesn't mean he isn't fully invested in the job he currently has.... and to date, comments included, he's never indicated that he's not invested here.