Wuuuut?
Drouin's never been anywhere close to point per game and I doubt he spent his entire career with depression, so it's really disingenuous to try to pretend he would be PPG so far at any point. I've never seen him align a long sequence where his decision making is on another level. Long term bouts with depression are a rollercoaster with highs and lows, so if he had the decision making capacity to be point per game, we would've seen at least half a season of that somewhere, somewhen in his career, but instead what we see is the same constant of erratic decisions, whether producing at 50pts/82games pace or lower, which is the hallmark of players who have a harder time processing the game.
Depression can be debilitating. It makes it hard to do ordinary things. Basically, motivation just isn't there. Anhedonia becomes a constant. All of this makes it a huge obstacle to train at a high level, but by all accounts, JD was and is always training hard. All this to say, I highly doubt depression was a constant throughout his career, whereas erratic decision making has been there at every point, even when he was producing.