Ah, you meant that. My apologies, we never properly defined what "rift" meant, so I just tried to assume from the context.

OK, so you envision that the rift is some sort of gate. But...if all the gods are coming to this new universe from their various worlds, then wouldn't they logically be coming from several different places? You'd expect there to be several gates. Or, perhaps each of the gods made their way there through small tears they made in their original universes. Tears that each one naturally closed off once they were done using them.