Dudes, stats really can't say much about Marchisio and especially about last season.
But I watched every Juve match and I know that last year there was no difference in Marchisio's play when he played CM or LM. At least there wasn't some visible difference since even when he was a LM he was playing more like a CM, rarely occupying the wing in the opponent's side of the pitch. He was doing just as good or just as bad in both positions. That's my whole point.