I don't think Osimhen is any burden to the club. As a matter of fact, he has contributed immensely to the development of the club to the level that he was meant to be awarded a the king of Napoli, in my opinion, but the position went to Kvarat. I know the player was not in good times with the manager and they're misunderstanding relationship greatly affected the performance of the club in the last season compared to when Osimhen was still very functional
Going to Galatasaray was a break for him, but I wish he had go to Chelsea instead. Chelsea was a good option to Osimhen since that will affect his career strongly. However, Galatasaray isn't a bad idea yet and they need to keep the guy's spirit high to get maximum resultd from him. Football is all about emotions after you've taken out the skills and talents
I also do not think Osimhen was problem for Napoli. Actually he helped club grow a lot and deserved to be recognized as one of top players even though Kvaratskhelia got that honor. Osimhen disagreement with manager hurt team performance last season. Moving to Galatasaray gave him new chance but joining Chelsea would have been even better for his career. Still Galatasaray can get best out of Osimhen by keeping his spirits high because football is about feelings and motivation not just skills and talent.
The problem is the dispute between Victor Oshimen and their manager which makes the club unable to perform optimally because both of them cannot create good chemistry and cooperation but Oshimen is not a burden for the team because he has made a pretty good contribution so far so if his hard work so far is not appreciated it is better to go to another team that can appreciate him more and going to Galatasaray is not a bad decision there he has the opportunity to play in the Europa League and I am sure there will be an elite club that recruits him whether it is Chelsea or Arsenal and maybe the price will not be as expensive as before.