The way you should look at any court case is what the lawyers aren't talking about. First they aren't talking about copyright, they keep taking about IP, a nebulous term with no legal meaning. They aren't talking about a contract between Zenimax and Carmac that gives them ownership of anything he developed because no such contract exists. And most important of all they are talking about destruction of evidence because they didn't find any evidence in discovery to talk about instead. Usually a destruction of evidence claim proceeds the case being thrown out for lack of evidence.