Why wouldn't he want to see how Vidal and Pirlo play together? After all, those two are the ones who are suppose to be playing together during the season.
because as he already said he wont play him in the centre of the pitch until vidal did totally grasp Contes ideas/tactics.
seeing as conte talks much to vidal in the training means conte thinks he has much to tell vidal to make him understand the system, so playing marchisio in the middle is more of a calculated risk compared to vidal who might have no clue what to do in key situations.
if you followed the game there where situations in the game tonight where conte called arturos name repeatedly probably meaning he is not satisfied with how he follows the orders.
i am all for vidal playing in the centre, but let him grow into the role until conte thinks he is at least as useful there as pazienza or marchisio
but the even bigger question i have is:
will i have to have such a haircut like antonio, when i do hair implants ?