I was reading the article on the D-backs collapse over at FG, and that lead me to read Jeff Sullivan’s article on the Humidor from August 16th, which I missed previously.
In that article Jeff makes a pretty strong case for Chase Field becoming much closer to a neutral run environment this year. In fact, I had previously been informed that FG was using a neutral park factor for 2018. However that does not appear to be the case. From the last paragraph of the article:
For outside observer purposes, I don’t know how much this really matters.