This ending might need some heavy amount of thinking here.After Bocca killed Solo (who's also the present Monster King), and Solo killed Sayako, did Boca become a new Monster King and Sayoko become the new Melody of Oblivion?

This ending might need some heavy amount of thinking here.After Bocca killed Solo (who's also the present Monster King), and Solo killed Sayako, did Boca become a new Monster King and Sayoko become the new Melody of Oblivion?