Olympus vs. Shuma Gorath

Time to repeat after Zeus.

Wouldn't Olympus win? Its citizens would be in a place of power, as would Zeus, while Shuma should be somewhat lessened?

I don't know about what the power levels of Zeus are but Gorath is supposed to be universal level.
If it can get a foothold in one of Olympus's dimensions it would have unlimited access to everything.