Well, what do you expect? Nobody wanted Allegri even though he was an Scudetto winner, a lot of attachment to Conte's charisma. As for Zaza, he's not an obvious talent: not a great goal scorer, not great at holding the ball or just plain not talented on the ball, so he'll have to prove himself at Juve. And he'll have to do it quick.
Spent 18M for Zaza is hard to swallow but next year when we'll pay 18M for Berardi is gonna be a bless and it's gonna make sense our agreement with sassuolo