In grieving you can feel depressed or sad. The fifth one is having a faulty childhood resulting in poor self-esteem or no sense of self. You are emotionally down because of your dislike for yourself. This is a psychodynamic depression. Most clinicians only know about the last one, the psychodynamic depression.
Psychiatrists have more training in the clinical depression and usually prescribe anti-depressants.
Because of Vietnam there is now more understanding of post-traumatic stress depression. But in the depression related to grief, the training is almost non-existent. Yes, but they may also miss the other kinds. There tends to be a bias in the observer. They might assume it's all grief, and not understand the other components.