Fwiw I am incredibly optimistic about Dusan. Despite our non-existing attacking play the guy is like a dog with a bone, fights for every ball, works his ass off and demonstrates great technique and instinctual finishing on multiple occasions. My argument has not never been that he steeply declined since he joined us, my argument is that maintaining close/similar ratio does not necessarily entail he is fitting here just as good as he did over there, because over a longer period it'll be more difficult to maintain this ratio.
In terms of the comparison between his stats at Fiorentina vs Juve, I was including the previous season not only the two halves of this season (hence the substantially longer period).
I don't know if you're hand picking stats or if different websites are reporting different numbers, but comparing the two half seasons or 1.5 season to half season it seems that his time at Viola is slightly better.
Sauce:
https://understat.com/player/7084
Ofc I agree with you that joining a dysfunctional Juve with no preseason can make a world of difference for most players. With a larger sample and a pre-season we will be more capable of making an apple to apples comparison.
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When Conte joined Spurs, they were bottom of the League in terms of distance covered during matches, within a few weeks they were in the top 3. Ofc the coaching staff has something to do with it, its not only random luck