I like this theory a lot, but I can't buy it. The dialogue in OoTS 1189 just doesn't fit a surviving Western god who is covertly helping the Snarl. If they've been helping all along, why is this time any different ("...we're finally doing this...") and why after hundreds of thousands of dead worlds are they about to die ("Fun while it lasted....existing")?
Second, I can't see a god hang on for hundreds of thousands of dead worlds if just one screwy world is enough to imperil Hel.
Third, he's a puppet.