Napoli can't use Osimhen anymore since he doesn't have a good relationship with this team anymore and Osimhen won't be useful for them regardless of his performance he had in this team before. Osimhen was a good talent in Napoli and considering his age he could have a good future in this team but soon after extending his contract with Napoli he wanted to leave the team for another team and while he had some offers he rejected all offers and decided to stay there.
Napoli just wants to earn money by selling Osimhen to the Saudis and that's why I think giving Osimhen to Al Ahli can be a good move for Napoli.
Since this new season started, Osimhen has not been included in the Napoli squad, so it is clear that Napoli no longer want Osimhen. So the decision to sell Napoli to Al Ahli was quite the right decision. The reason is that Al Ahli certainly has quite large finances and is certain to be able to buy Osimhen from Napoli. The reason is, several times it was rumored that Osimhen would move to big European teams such as PSG and Chelsea, but in the end none of that happened because PSG or Chelsea thought that Osimhen's price set by Napoli was too high.
However, for Al Ahli the issue of price will certainly not be a problem, because Al Ahli definitely has a lot of money. So, with this in mind, it seems like the possibility of Osimhen joining Al Ahli could be said to be quite big. Apart from that, if for example Osimhen could really join Al Ahli, he would definitely be a very sharp spearhead there. However, the problem is that currently Al Ahli already has two main strikers in their squad, namely Ivan Toney and Firmino. So if, for example, Osimhen is really recruited by Al Ahli, there will definitely be competition between Al Ahli's attacking players. Because it is certain that Al Ahli's two attackers definitely want to continue to get lots of playing minutes. And if, for example, Osimhen joins Al Ahli, it is certain that Firmino and Ivan Toney will get a little playing time. I don't know whether it will have a bad impact or not, but hopefully this won't be a big problem when Osimhen actually joins Al Ahli.
And meanwhile, currently Al Ahli is ranked 6th in the Saudi Arabian league and in a few hours Al Ahli will play a match against Al Qadisiyah.