गोविन्द भाष्य (श्रील बलदेव विद्याभूषण - अचिन्त्यभेदाभेद वेदान्त ब्रह्मसूत्र भाष्य सटीक)

tv apramaye kutaḥ pramā
"Nārāyaṇa is the head. Pradyumna and Aniruddha are the right and left wings.
Vāsudeva is the torso. Or, Nārāyaṇa is the torso, and Vāsudeva is the head.
Saṅkarṣaṇa is the tail. In this way the one Supreme Personality of Godhead is
manifested in five ways. In this way the Supreme Personality of Godhead enjoys
pastimes as both the limbs and the possessor of the limbs. The Lord's power and
opulence have no limit. He is inconceivable. How can mere logic grasp Him? He is
immeasurable. How can He be measured?"
Sūtra 16
ātma-śabdāc ca
ātma—ātmā; śabdāt—from the Śruti-śāstra; ca—also.
Also because the Śruti-śāstra employs the word "ātmā".
Purport by Śrīla Baladeva Vidyābhūṣaṇa
In Taittirīya Upaniṣad 2.5.1 the bird is described as "ātmā" (the Supreme). For
this reason the bird here cannot be an ordinary bird with wings, a tail, and other
like features. The bird here is a parable.
Sūtra 17
ātma-gṛhītir itara-vad uttarāt
ātma—ātma; gṛhītiḥ—understanding; itara—others; vat—like; uttarāt—from
the following.
"Ātmā" here means "consciousness". Because of the following it is like the
others.
Purport by Śrīla Baladeva Vidyābhūṣaṇa