I wrote to organize what I understand.
The strength of a sotapanna‘s Upadana cannot be the level of apayagami. (O)
Because moha cetasika reduced avijja level.
The strength of a sotapanna‘s Tanha cannot be the level of apayagami. (O)
Because apayagami gati has removed.
So, in the “arammana – vipaka vinnana – gati to attach – samphassa – samphassa ja vedana – tanha” process, “apayagami gati to attach” step can not happen. Therefore, apayagami level tanha can not happen too.
It means that unconscious(automatic) responses(mano sankara, tanha) can change with steady conscious effort(controlling kaya/vaci sankara and upadana step).