I agree that combination of Khvicha Kvaratskhelia and Victor Osimhen was key to Napoli success last season. They worked well together and scored some great goals. It is surprising that Napoli might sell Osimhen but they must have their reasons. Osimhen is talented player who can do well at any big club. However I think it would be mistake to let him go without finding someone equally good to replace him. Napoli should be careful not to ruin the team chemistry. Keeping both players would be best but if not I hope they have good plan to stay strong offensively.
Napoli have actually prepared themselves to bring in Lukaku if they have succeeded in selling Osimhen. And yes, it is a step to keep Napoli's attack line strong after Osimhen left. But it looks like Napoli is having difficulty finding a club that can pay for Osimhen's expensive transfer. And Napoli have also lowered Osimhen's transfer price but it seems that this is not enough to make clubs interested in signing Osimhen move quickly to secure this talented striker. Chelsea and Arsenal are still linked with Osimhen but there has been no new news regarding them.
I personally think that the combination of Osimhen and Kvaratskhelia is one of the best ever. but after some problems arose there and after Osimhen suffered an injury after that I noticed something was different. Where I feel like the two of them are starting to not resonate well. Maybe because Osimhen is no longer comfortable there or because of Napoli's new coach last season who didn't have a suitable strategy there. But if Osimhen fails to leave this season then I think Conte will be able to make Osimhen and Kvaratskhelia a great pair again there. And I'll be looking forward to that.
Khvicha Kvaratskhelia is a teammate who had good chemistry with Osimhen last season. However, currently the chemistry between the two players is a little less good. Because, we can see the proof in the Napoli match this season, Osimhen and Khvicha Kvaratskhelia are no longer as compact as last season. So Napoli management definitely believes that if Osimhen is sold it will not have a big impact on Napoli's attack line. The reason is that this season the chemistry between the two of them when playing on the field is also not good. However, the problem is, we don't yet know what problem caused Osimhen and Khvicha Kvaratskhelia's chemistry to be less than good. Is it because of the coach, or because of personal problems. Because currently I think Osimhen is no longer comfortable at Napoli.
However, according to my personal prediction, the problem may be caused by these two factors.
Then regarding the sale of Osimhen, I also don't understand why the teams that are interested in signing him are still very doubtful about Osimhen's price. Indeed, the price is quite expensive, but in my opinion, at that price it can still be said to be commensurate with the performance it has. Because Osimhen is still very young, he also has extensive skills and experience. So teams who are interested in signing Osimhen don't need to hesitate to buy him. However, until now the teams that were rumored to be interested in bringing in Osimhen, seemed half-hearted in buying Osimhen. Even though as you said, Osimhen's price has now been lowered by Napoli, these teams are still hesitant to sign him.
And if, for example, Osimhen's sale is hampered in the transfer market this summer, then it is certain that Lukaku's recruitment will also be hampered and most likely will not happen. So Napoli must really think about the possibilities that might occur and find a way out to overcome this. Because of Napoli's current plans, it could be said that they are too focused on selling Osimhen.