Sometimes not all managers and teams click, that doesn't mean that the team was terrible, but it also doesn't mean that the manager was bad. That is a risk that the managers are taking, Garcia wasn't the manager to lead Napoli, that doesn't mean Garcia is a bad manager, the downside is that he will be labeled as the guy who took over a champions Napoli team and "ruined" them, not like they were doing that terrible to be fair, they are doing fine.

I think that's going to be the label for him and he will have harder time finding a job, or at least at a high level club. This is going to be fine though, because if he finds a club he clicks well with, then he is going to do better and he will show himself to be a good manager again.