Mate, his Parma side was absolutely a top team when he joined them. To argue otherwise is absolutely nonsense. They were one of the best clubs around then, they had finished 2nd in Serie A when he took over, ahead of the great Inter side that had the likes of Ronaldo, Djorkaeff and Simeone. Parma had sensational players like Buffon, Cannavaro, Sensini, Thuram, Baggio, Chiesa, Crespo and Asprilla.
The only side he's managed that weren't already a top side is the 1st club he ever managed, Reggiana and he brought them up from Serie B. Every other club has absolutely been one of the best, and that's fine. This is something different to all of that, which is fine too.