Choose a villain to return in dragons rising

Pythor: lets say he encounters Ras and teams up with him only to betray Ras to steal the source Dragons Icons Ras then pummels Pythor into oblivion Nadakhan: someone finds his teapot and releases him by accident. He remembers Skybound and goes to seek revenge. he learns about the Merged realms by total accident when he comes across New Djinjago. he still wants revenge but he ends up losing a fight to Arrakore. Ashpeera: she has a source Dragon Icon and gets beaten up by Ras Crux and...