He had 23 goals last year while being integrated into the squad. Who is to say that he can't come close to 30 goals this coming season?
Actually its 21 and this is if you count every competition he played in!
I was referring to Serie A alone but even if you go every competition going from 21 to 30 is around a 50% improvement which is definitely not probable...
As for - We now have Pjanic - yeah but it will improve our overall play its not as Pogba and Pjanic will assist 12 each... they both have the potential to do so but having him will definitely improve our team!
If we dont sign a goal scorer I expect Dybala to remain our top scorer otherwise I expect him to be second but I still expect him to score around the same number of goals next year