25 million euros is the most I would hope to get for Zaza. He was bought for 18 (I believe) and had an average season with not much impact overall and then a crappy EURO with only a retarded penalty to be remember for.
Allegri loves Mandz but his true love is Dybala. He reaslizes that for us to be powerful up front he needs to be the one leading it just like Tevez did. Mandzukic is the byproduct of making Dybala play well not choosing him over Morata IMO