The genius was with Ranieri. As with most of that 15/16 team, he pinpointed a specific skillset from each player and made them do that and then combined them all together into a phenomenal unit.
Kante was not especially that sort of midfielder before coming to us and, apart from his first season at Chelsea, he hasn't been since.
It was a brilliantly simple approach. He asked who the best player was - the reply was Mahrez - so he said, right then, give him the ball. And so on.
Ever since, I've been mystifed by both how Ranieri has been a fairly mediocre manager everywhere else, and why other managers over complicate the game so much. It really is just get players to believe in something and then do what they're best at, keep it simple and make sure messaging is clear. Every great manager does that.