That would work, but only if Gozer and Vigo weren't determined to conquer the world by themselves. Remember Gozer said, “The Traveler has come, jews and berries.” Oops, that's not right, I mean, “…choose and perish”.
Yeah, that's better. Also, remember that Vigo said, “Now is the season of evil; bring me a child, so that I might live again.” Gozer referred to itself in the 3rd person, while Vigo said “I”…“so, that ‘I’ might live again.” If they were both to be part of a plan preparing the way for a far more dangerous supernatural power, then that plot idea would have been hinted and established early on in both movies.
If you want to make your idea work, then you could say that Gozer and Vigo failed in their conquest for destruction and world domination; thus, allowing a more superior demigod to succeed where they both failed.