Cocks isn't a creative at all, he's CEO of Hasbro, he's the type that exploits those who are creative and talented for profit. Did you mean Jeremy Crawford?
Winninger might have made a few choices that weren't good, its hard to say who decided or came up with what, but he was GREAT at transparency and communication and he was clear in his opposition to the OGL scandal and it might have been the thing he left over.
The people after Winninger are a deep cause for concern. CEO Cynthia Williams, Vice President of D&D I forget his name, and Jeremy Crawford who design philososphy on setting is aweful.