I don't think that's the case with Cronin. The Avs in 16-17 were an utterly horrible team. I'm pretty sure all of Grigorenko, Bourque, Iginla, Tyutin, Wiercioch, Colborne, Mitchell, Goloubef, McLeod, Gelinas, and Jeremy Smith never got NHL gigs after that season. That's an absurd amount of regulars to not be NHL caliber.
The Ducks have a ton of players who are young, fast and skilled. It doesn't make sense as to why Cronin isn't able to get more out of players like Carlsson, McTavish, Gauthier, Mintyukov, Zellweger etc. That team BLEEDS scoring chances against. It's growing pains for sure as young kids but I also don't believe they should be THIS bad, especially when their goaltending is this good.