If Napoli doesn't act fast and allow Osimhen go to the club of his choice, they'll become the loser when his contract expires. I feel that Napoli management is not looking it from this angle because they feel they have the power to dictate for Osimhen which club to go to. Osimhen does not give a fuck about all these and he didn't allow that to affect his performance.
Osimhen's contract with Napoli ends in the summer of 2026, and right now it makes no sense for them to loan him out for another year because in a year he will become a free agent and Napoli will get nothing for him. So if I were them, I wouldn’t cancel the deal with Galatasaray, especially since they have already agreed on almost everything. It's better to make some compromises on the payment terms now than to let Osimhen leave as a free agent next year.
Their is a saying in my country that says; a decision made in anger is always very costly.
If Napoli gets more angry that they can't force victor osimhen to go to Saudi Arabia and they decide that he wouldn't be going anywhere else, they are the one that it's going to affect the most more than the player, because during his final season that he is not playing, they must pay him every penny, and they are definitely going to lose him for free, which is going to be a big blow to the finances of the club.
Then as for the player, his career will just stall just for a year, after that he will be very ok, so as it stands now, Napoli has more to lose than victor osimhen, so is either they make compromise or they foolishly let him stay back and put them in a difficult situation financially