What is Cosby right about? He doesn't approve of Ozzy? Who cares what he thinks about Ozzy or anything else?
Condemning the morality of others is always a waste of time because it inevitably bites the one who's condemning on the butt and makes them look like an ahole blowhard phony.
This case is no exception to the rule.
It got Cosby's name back in print didn't it? And tentatively it's putting him on the "high ground" (he's not on the receiving end of a controversy although he may receive some backlash).