@FoxFoxFox well i mean i know where you are coming from but i think you arent taking into account that for depression to exist there must be a self to identify with it. But this can still be debated since depression is an abstract word which can point at slightly different direction and so is the world enlightenment.
What i am trying to say is that enlightenment is freeing yourself from the suffering and depression is in my opinion particularly that. - suffering- or in other words not accepting your experience.