I really appreciated your article, and came to virtually the same conclusions myself in what I posted a few days ago: https://medium.com/invisible-illness/do-healthy-bodies-really-produce-healthy-minds-f6172d7160e7?sk=9d561f11a610f4496b892ceab9ad3d7d

One additional point is that many of these studies looked at "depressive symptoms" in people who were not necessarily clinically depressed. It is a far different scenario to be making improvements in mood in people who have full blown depression versus people who just have a few signs of depression to begin with.