You have to say that Tuchel completely out-managed Pep from start to finish. The art of management is not only get your team to play how you want them to but to get the opposing team to play how you want them to and Tuchel did this to perfection. Chelsea never once looked out of shape and they never needed to change formation throughout the game. We started with no DM or striker but ended with with one DM & two strikers, by which time we were shambolic.
I suppose this answers the question of what we do when Pep eventually leaves. We get another good manager who knows how to set up a very good squad of players for important games.