Napoli recruited Conte as the new coach for next season and I think, Conte is a reliable manager who also certainly has good quality and experience. After all, Napoli is not only about Spalleti to be able to win trophies, of course with other managers also Napoli will have an equally good chance if indeed, Napoli get the right coach. After all, when Napoli managed to get the Scudetto at that time, the fact that other competing teams such as Milan, Juventus and Inter also experienced unstable performance so Napoli managed to get consistent results in that period. So yes, if Napoli get the right coach or manager, then if Osimhen stays at Napoli too then Osimhen still has a chance to get another trophy. But indeed, if Osimhen has chosen to leave, then it is also not a problem because Osimhen deserves to play in another big team.
I don’t think that Napoli became champions only because of the crisis in other clubs, they were simply stronger than everyone else and no one could keep up with them, as was the case with Inter this year.
As for Conte, this is an easy choice for him - I don’t think Napoli can go any lower (even if Osimhen and a few other players leave), so no matter how the season turns out, it will be better than this, so Conte has at least two season to achieve something with Napoli.
Yes, Napoli was in amazing form that season; they won their recent serie A title, and no club would match Napoli's shoulder-to-shoulder, and Osimhen was always available for Napoli that season. But last season, Osimhen was not always available for Napoli because of injury which caused Napoli's form to drop last season. Conte will improve a lot of things at Napoli, which will make them challenge for the Serie A title next season. Napoli already has quality players who can play against strong clubs and get positive results, but they just need a good coach who can help them perform well, and Conte is the man.