Napoli will never let himself be weakened because he knows that if the players join another team they will be weaken and their performance will also be known. There is also a reason for this that other teams think that they can sell him for a certain amount of money so that they can get this worthy player. The Napoli has made a very good decision because Galatasaray change a lot of players and they have such players and Juve is a good player and has take their team to a lot of progress. Apart from this this player is get a lot in this team that he wants.
The conditions made by Napoli for Osimhen's release clause or Osimhen's transfer to Galatasaray which does not allow Galatasaray to sell Osimhen to a Serie A club within a few seasons has also been proof that Napoli does not want any good players they have ever owned to belong to a club that will compete with them in Serie A.
And this also illustrates how extraordinary Osimhen truly is. To the point that Napoli didn't want him to join a club from the same league. Napoli surely realizes that Osimhen would pose a very real threat and would truly enhance the attacking prowess of any team that has him.
It's a shame, i am very sorry that Osimhen no longer plays in Italy, i liked him as a player.