What caught my attention was Uppatti Paticca Sammupada is a specific version of Idappaccayata Paticca Samuppada.
Then I thought that Uppatti Paticca Samuppada starts from salayatana paccaya phassa too.
So I referred to this diagram to contemplate Uppatti Paticca Samuppada.
Purana and Nava Kamma – 1 (new).jpg
From the “namarupa paccaya salayatana” stage, up to the “tanha paccaya upadana” stage, kamma nimitta or gati nimitta comes in as sensory input.
Next, one clings to nimitta through tanha paccaya upadana.
avijja paccaya sankhara leads to the arising of javana citta.
sankhara paccaya vinnana initiates the operation of kamma vinnana.
vinnana paccaya namarupa begins the generation of uppatti bhava energy. (dhammā rupa)
Finally, in the bhava paccaya jati stage, the dhammā rupa formed in the vinnana paccaya namarupa stage now condense up to the suddhatthaka stage and form the kammaja kaya, namely the birth of manomaya kaya.
Subsequently, bhava paccaya jati applies again, leading manomaya kayas to acquire karaja kaya.
If there are any inaccuracies in my understanding, please let me know. Thank you.