Blaming Zacha's linemates at this point makes no sense. Year 1, fine, that year is done now. Last year here are the forwards he played more than 100 minutes with, in order:
Miles Wood, Kyle Palmieri, Stefan Noesen, Jesper Bratt, Drew Stafford, Taylor Hall. That's a pretty decent set of linemates - it's not great, but it's not significantly worse than what most 2nd/3rd line forwards are getting in terms of linemates. The production wasn't there yet.
We'll know a lot more at the end of the season. I think in those first two games he showed another level, and I see that other level on certain shifts in other games. If we see that more, the points will come.