I think Chelsea is a great example of what I was trying to say, a lack of chemistry wasn't the right term to use but as you mentioned, a lack of proper management. If you look at their squad, they don't have many world-class players like Ronaldo, Salah, Messi, etc. Rather, they're able to develop their players to reach a world-class level (I could use many examples: Mendy, James, Rudiger, etc). But why they've been so successful with Tuchel is because of his great management and that every player understands exactly what their role is.