It makes sense that the Buddha talks about conditions at the moment. In the 6.2 he says: Suppose there were totally and utterly no upādāna for anyone anywhere. That is, upādāna at sensual pleasures, views, precepts and observances, and theories of a self. When there’s no upādāna at all, with the cessation of upādāna, would continued existence still be found?”
Here it clear that he is not describing the upādāna at the cuti-patisandhi moment, but the upādāna day to day. This is the same for his description for Taṇhā and Vedana. I have some questions though:
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At 21.1 in Mahānidāna Sutta, the Buddha says:
‘Consciousness is a condition for name and form’—that’s what I said. And this is a way to understand how this is so. If consciousness were not conceived in the mother’s womb, would name and form coagulate there?”
“No, sir.”
“If consciousness, after being conceived in the mother’s womb, were to be miscarried, would name and form be born into this place?”
“No, sir.”
“If the consciousness of a young boy or girl were to be cut off, would name and form achieve growth, increase, and maturity?”
“No, sir.”
“That’s why this is the cause, source, origin, and reason of name and form, namely consciousness.
Why does the Buddha talk about the mother’s womb when the sutta is about conditions at that time/ Idappaccayatā Paṭicca Samuppāda?
Another interesting thing is that the Buddha skips saḷāyatanapaccayā phasso in that analysis, and links nama rupa straight to phasso. He also stops at viññāṇa in his anaylsis, he does not go back further to talk about avijja and sankhara.
It is also interesting to note that the Buddha describes another cycle in the middle of the PS cycle:
So it is, Ānanda, that feeling is a cause of craving. Craving is a cause of seeking. Seeking is a cause of gaining material things. Gaining material things is a cause of evaluation. Evaluation is a cause of desire and lust. Desire and lust is a cause of attachment. Attachment is a cause of ownership. Ownership is a cause of stinginess. Stinginess is a cause of safeguarding.