Maybe the very act of creation was Sealing off the Outside - to the best of the Creators abilities. The Old Ones were actually not Sealed off outside of the Gates.
OH yes. Gotta look around at all the creation theories to add the DF up, but as far as the original creation, It similar enough to the concept of taiji, yin and yang in harmony. Before the original division only wuji existed, no form. When the mothers took form in opposition to each other they defined reality. And Dormammu has been trying to get into our little pocket of reality ever since! *cough, cough.... aggh*
