Lukaku is not too bad and he still deserves to play in Serie A. Antonio Conte may have his reasons and he has also worked with him before. Yes, bartering might be an ideal option between Napoli and Chelsea, because both teams need the services of both players. Conte also doesn't seem to be too worried if Osimhen chooses to leave because the Italian doesn't want to be trapped by his privileged attitude. I'm sure Conte has prepared a thorough plan and he will first focus on overhauling the defense, because that position was very risky before.
Plans are involved for the growth of the club, Napoli will bounce back to extreme form but it's just a matter of time. Napoli new coach, Antonio Conte will make sufficient usage of his players. He's one of the promising coach that wouldn't settled for lesser scores, will bring on his best. Whereas in the case of Lukaku, he is an important player, he enchanced his ability and will exert more pressure towards the end of the league.
Antonio Conte has a good records in the world of football, and he has achieved a lot in Serie A and other competitions. So, I also believe that he is going to do better in his stay in Napoli. However, with Napoli's current situation, I can't really predict that he is going to compete with other teams in winning next season's Serie A. Antonio Conte may show his talent as a better coach.
Regarding the issue of signings, it may be a very good idea for him as a coach. He knows what he sees in Lukaku, and that is the reason why he is so interested in signing him. As for me, looking at Lukaku, I don't think he can really perform as well as Osimhen, whom Napoli wants to sell and replace with Lukaku. But let's see what will happen before the season starts. They may sign Lukaku and sell Osimhen, and both could end up in the team.