Both Vidal & Asamoah bring the strong, physicall and endless running game to the midfield. IMO Marchisio's intelligent running into space and darting into the box isn't something we can go without. We had brawn with Vieria & Emerson back in the day and that didn't win us CL but yes we dominated Italy. Strength only gets you so far. I think Marchisio and to an extent Marrone are smarter/more intelligent off and on the ball than lets say Vidal (as we saw with his passing at times

) but Vidal easily made up for that with his ball winning.
Doesn't do us any good have two good ball winners but no support to the front men.