Leao has all the tools to become one of the best in the world, his lack of stamina blocks him. Yes, he needs to smooth aspects of his game out, but he's making progress every year, and I hope he can make a big jump next year. But even if he makes that jump in production, if he stays as is, he will always have a limit.
I actually think his lack of stamina impacts his execution in his passing, shooting, etc. I think his next jump will be down to him improving his engine, he just has to, because Vini's engine is insane.