User blog comment:TemTheory/Season 15 Theory/@comment-98.165.3.139-20190506175755/@comment-98.165.3.139-20190506190746

Check the scene where Chuck 1st reappears. Cas says, "God" …. Chuck just makes an unpleasant face and says "Eh", then Cas says "Chuck" and Chuck says, "there you go." In the original appearances, he would always say yeah I'm God but call me Chuck.