I don’t see anything wrong in bringing Osimehn to Chelsea at this point, they know they need a clinical striker and only Osimehn is currently in the market that they can get and do the work for them. The transfer window is gradually coming to an end of Chelsea needs this player, they need to be decisive on time and get him on board sooner. They can also get Joao Felix back into the squad with news already speculating that talks have gone far for Chelsea to sign him back on a permanent move this time around. Chelsea will be much better and I see them having a better season if they bring this two players into the squad, I just hope they don’t fade on this and regret it later.
I can say signing Osimhen isn't a bad idea if Chelsea can sell some of their current strikers. Lukaku, Broja, David Datro Fofana, and Deivid Washington are some strikers to be sold first before they sign new strikers. Moreover, they are reported to sign Felix, there will be too many strikers if they don't sell some of them. If I'm a part of Chelsea board, I will be focusing to sell some players first before I plan to buy new players. Chelsea also has too many goalkeepers as well, they have 6 goalkeepers. This is nonsense, why Chelsea wants to waste their money for unused players.
Back to the plan to sign Osimhen, it may resolve the problem of quality striker in Chelsea squad. Chelsea has many strikers now but only 1-2 strikers who have good quality and experience. Unfortunately, Lukaku is no longer expected to play as the main striker of Chelsea. Chelsea only has Nicolas Jackson as the option of the striker. He is still not proven enough to be the mainstay player. That's why Chelsea board is satisfied with the current Chelsea stikers.