As much as I admire Sissoko's style on the field and force. Zanetti is one of the best players ATM in his position, not only in Italy but Europe.
I totally agree with you but having cover is very important as well and seeing how we want to fight for the CL and Serie A next season Sissoko is a great addition to the team. Zanetti is a starter atm. no doubts about it.
Sissoko is also very young when compared to Zanetti so I think he will be mentored by him somewhat, as Nocerino is. Zanetti is also a good pro and will not mind being rotated or spending time on the bench inorder to keep every one happy and in top condition.
I think alot of people don't see the big picture with the purchase of sissoko. Not buying him because we have one player who is doing a great job would be foolish. Just imagine if god forbid Zanetti blew his knee out tomorrow? Juventus are a top team and need to have depth not just focus on one good starting 11. Look at Man Utd, Inter, Madrid ....

