His comments aren't off base at all.
Whiteside has shown a crazy good ability to rebound and defend.
Cous says that his defense and rebounding reminds him of Russell. Cous can make that comparison if he wants, he saw Russell play in person, most of us didn't.
And Whiteside is definitely worth three first round picks.
And I agree with others, Roys dementia comment seems out of character and tasteless.. Something koz would say but I expect better from Roy