Like I said, Marrone has some similar qualities to Marchisio, but doesn't play in the same style. I wouldn't see them as direct replacements for each other, but I think either could play in the same role in the team. The biggest difference being that Marchisio carries possession forward more often and dribbles, while Marrone usually looks to make the pass and keep the ball flowing (which is not to say that he doesn't make runs forward, he often hovers around the edge of the area waiting for anything to fall to him).