Hammer hits nail square on the head…I think you will ultimately be right. As much as we have not wanted to face this reality.
Sonny, Lloris and Kane are not problems per se but when you are bringing in coaches like Jose and Conte because you want them to get the best out of your best players and win trophies you are probably sacrificing many other aspects like team chemistry, a system that works for the club/other players, space for young players to grow.
For example, Kane and Son will not be left out of the team, so they kind of dictate the system and vice versa. You can't leave Kane out, he's too important.
Whereas if a coach like Ten Hag comes in, he doesn't place too much importance on one player, it's the system.
We are not Real Madrid. We can't hire a coach like Ancelotti and let the big players just get on with it and silently manage the rest. We need a coach who controls every decision on the field/footballing side.
I am not for one second saying Kane is an issue for Conte, he clearly isn't, but if you bring in someone like De Zerbi I think it's better in everyone's interests to start afresh.
But then there is one major issue....