There are all sorts of mental health issues, only some of which deal with emotions. That's the difference. So no, it's not splitting hairs.
Otherwise, I agree that it's perfectly reasonable to wonder why a guy's having a down year IF he is indeed having one. However, in this case I think his character is being assassinated based on two things...A) We already know why he's out of the lineup. He's got a neck injury (whiplash) which has been diagnosed. B) He's not having a down year. 22 pts. in 33 games puts him on pretty much the exact same scoring pace as he's produced at for the whole of his career. There's nothing to suggest that his game is suffering, and if it were, there's nothing to suggest it's anything other than the injury sustained during the hit to the head.
He's injured. He's not a malingerer, and if he has had (most aren't permanent) mental health issues, there's no reason to believe they're what's keeping him out of the lineup or causing a down year (which he isn't).
My mistake, man. I was responding to the notion that some have that he is lazy and sucks. I don't think so, and I know many also do not. Your summary makes sense in the immediate sense. I wasn't intending to accuse him of sitting out because of emotional or mental issues. I was addressing his streakiness that some consider laziness. I should have been more specific.