OK. I see the misunderstanding.
I have revised #4, #5, and #9 of the post to make it more clear.
“A saddhānusārī (or dhammānusārī) is incapable of dying (separating) from that Noble birth until he realizes the Sotāpanna stage”. This does not mean a saddhānusārī will attain the Sotāpanna stage within that lifetime. Once “born as a Noble Person” one will not die from that birth, i.e., one WILL get to the Arahant stage without ever getting a birth in the apāyās.
– One gets a “Noble birth” when attaining the Sōtapanna Anugāmi stage. One is now one of the “attha purisa puggalā“.
So, basically, a Sōtapanna Anugāmi may be born many times a human until getting to the Sōtapanna stage (may even have many human bhava, each with many human jāti).
– Once getting to the Sōtapanna stage, there would be only seven maximum number of “bhava” left, within which one WILL attain the Arahant stage.
I just translated the sutta in #4. It was clear to me, but I realize that it may not be clear to someone just reading the post.
– The post was already a bit long. This is why it is hard to provide a good translation of a sutta without getting into details.
– A given sutta (especially deep ones) need to be discussed in detail.