Completely missing the point. The difference is that taking over a successful team, that is absolutely buzzing, in a brilliantly run and stable club, is an amazing start for any manager. Most new managers take over a team that's gone wrong, not one that the previous manager has already got flying!
I don't see why it's so hard for you to accept that de Zerbi took over a very good team, that was in a very good place, that Potter's good work had got them to.
As has been said before, it's not binary, one manager good, the other bad. Just get used to it.
Obviously not. Considerably better than, say, Hiddink, Porterfield, Shelitto and Blachflower (and others) for instance. Comparisons with Poch are slanted by the fact that Poch had a full pre-season and opportunity to get rid of at least some of the cancer in the Chelski dressing room, but has...