I’m guessing that the reason Odin is so happy is because in this story, the Greek Pantheon has been on top for too long. But now, after losing both Poseidon and Heracles, they are considerably weakened, leaving room for the Norse “Pantheon” — if you can call it that — to take over.
Edit: Almost forgot. To add flame to the fire, Zeus, the so called God of Gods, got practically humiliated by Adam. Other gods might feel it’s time for Zeus to step down.