I don't know if you did watch osimhen play at the AFCON, are you going to credit his performance to the strategy of the coach of his national team too? away from any coaches strategy, is the personal efforts and performance of a player which is first examined before talking about the coach strategy. There are performance we will see from a player and you can tell if the coaches strategy is the reason he is doing so well or not nevertheless I'm not disputing the impact of spallerti's strategy and tactics during his time at Napoli but beyond that are other factors which I believed played huge role to osimhens performance than spalleti's strategy. I wouldn't want to stretch this argument but I know for sure that osimhen is a very good and brilliant player.
I believe one of the features you are trying to commend is self work, I believe osimien is one of the few players that works so fucking hard on himself that even when the team is actually having a bad day he stretches out and want to make things work out for the team. I could relate to what you are trying to say because despite the hard times and poor form that the whole entire Napoli team was having I believe some players were still made exception of it and one of them is osimien.
A player's performance cannot be separated from the role of a coach who knows him well. Many players are successful with one coach and fail with another coach, that's why I say the role of the coach is also very crucial for a player, even though in the end it is the player himself who will determine the shape of his game. but usually coaches really know a player's strengths and they know how to use them.
I will talk about the mega star, Cristiano Ronaldo. When he was at Manchester United he didn't get many opportunities and the coach said he couldn't be relied on any more. But when he went to Al Nassr, he could be very dangerous and he managed to score a lot of goals and become top scorer. This is a simple example where the role of the coach will also be very necessary in determining and utilizing a player's abilities. For me it is something that is interconnected.