Why does it matter so much that Ghostcrawler is with or without the company.
As far as i've seen he was just a public face, the lead, the "manager". According to his own tweets he was only involved in features in UI. Who the hell knows what "features" is? He only mentioned transmog as an example as that's not exactly a game defining or gameplay feature.
Blizzard, like any company, is a collaboration - They'll have meetings, ideas will be shot about and ghostcrawler was most likely the guy to say yes or no to particular features. And most of all, he was warcrafts public face.