Sri Aurobindo like all Avatars that proceeded him came from the same Divine Being who is concerned with the Divine Manifestation in creation. Supreme Sacchidanand of course but that poise of Sacchidanand that leans towards creation.
However each Avatar takes his own unique station from where he acts and pours the light and consciousness of that plane upon earth and men. Just as Lord Rama took his station in the illuminated mind and Sri Krishna in the Overland, Sri Aurobindo took his station in the Supermind though all come from the same One Divine Being.
As to others who go beyond the manifestation nothing can be said as they enter into the Impersonal Brahman.
