But nether said that depression is "sadness without cause" which appears to be incorrect. At least, according to this page from the NIH:

http://www.nimh.nih.gov/health/topics/depression/index.shtml

I don't see anything there that indicates that sadness must be "without cause" to constitute depression.

Contrasting normal everyday sadness versus clinical depression, requiring medication, is accurate.

True. But we should be careful when making that distinction, whether for ourselves or others, as the line isn't necessarily cut and dried. I think just dismissing someone's report of being "depressed" as "that's just normal sadness" is a very dangerous mindset. If someone's sad enough to choose the label "depressed" for themselves, that alone probably suggests that it's a matter to be taken seriously.

First of all, I don't think Brad had "everyday sadness". Secondly, he may have required medication.

Medication ??and/or psychological therapy??