No way Lichtsteiner was more influential than Marchisio. Barzagli is arguable.
Marchisio was Juventus' most complete and decisive player of the half-season. He contributed greatly for all the phases of the game, mainly the attacking and transition ones, and scored a bunch of important goals. Plus, Vucinic and Matri would struggle even more without him. He's the guy who links the lines of the team.