Here we can safely conclude that the reason for this is/was Ronaldo.
Cuadrado has the most weird stats in the last two seasons. This year after 30 matches he has 5 goals and 0 assists. Last year after the opening 30 matches he had 0 goals and 11 assists. I've never seen something like this. Someone who last season couldn't score and made tons of assists, now scores a lot but can't make an assist! Incredible.
But there is an obvious reason for this, and that is Ronaldo. Indeed, Cuads played further back under Pirlo, but it was Ronaldo who was instrumental for Cuads stats. He was either scoring on Cuads crosses, or taking players on him and freeing Morata to catch Cuad's crosses. Now there is no Ronaldo, Morata is alone and well guarded, so Cuad's crosses can't find their target and instead of crossing Cuadrado is shooting more often, being in a position to shoot much more often now that he plays in a more advanced role.