I’m not convinced that is the case. The studio was purchased by a holdings company, then its CEO bought four early sketches of DE from the studio for pocket change. When Kurvitz, Rostov, and Hindpere (writer) objected, they were demoted and later fired. Unless another exchange took place, I don’t see how this would amount to Kurvitz selling his rights; at the very least, he still owns Sacred And Terrible Air (with DE itself naturally belonging to the studio).