Although an incarnation of the material energy, Lord Brahma is nonetheless the director of the material mode of passion
“Lord Viṣṇu is in the category of svāṁśa because He has opulences almost equal to Kṛṣṇa's. Kṛṣṇa is the original person, and Lord Viṣṇu is His personal expansion. This is the verdict of all Vedic literatures.
Although an incarnation of the material energy, Lord Brahmā is nonetheless the director of the material mode of passion. Similarly, Lord Śiva, although simultaneously one with and different from Lord Kṛṣṇa, is still the incarnation of the mode of darkness. However, Lord Viṣṇu is Kṛṣṇa's personal expansion; therefore He is the director of the mode of goodness and is always transcendentally situated, beyond the jurisdiction of the modes of material nature. Lord Viṣṇu is the original personal expansion of Kṛṣṇa, and Kṛṣṇa is the original source of all incarnations. As far as power is concerned, Lord Viṣṇu is as powerful as Lord Kṛṣṇa because He possesses all the opulences.