Kṛṣṇa as Bhagavān Himself, not an expansion or portion. The Gauḍīya reading rests on Śrīmad-Bhāgavatam 1.3.28, kṛṣṇas tu bhagavān svayam; Caitanya-caritāmṛta Madhya 24.85 adds that it is in Vraja, through rāga-bhakti, that He is attained under that title.