Yes. You are correct. Saññā ALWAYS arises in the manomaya kaya, whether it is a Brahma, human, or animal.
- All thoughts (with rupa, vedanā, saññā, saṅkhāra, and viññāṇa) arise in the manomaya kaya, NEVER in a physical body. P.S. For those who think thoughts arise in the brain, most animals do not have brains.
- Also, remember that in the suttas, rupa, vedanā, saññā, saṅkhāra, and viññāṇa refer to the respective upādānakkhandha, i.e., rupaupādānakkhandha, etc.
Regarding (ii) above, see “Rupa, Vedanā, Saññā, Saṅkhāra, Viññāṇa – Mostly Misunderstood.”