My claim was that they were "never on a developmental path to produce
either gamete" and you did not show that claim to be incorrect.
A reproductive system which includes "sterile testicular material" is never going to develop any healthy gametes.
Therefore, these individuals cannot be sorted using the
gametic binary and we have to include some additional criteria in order to sort them into a male/female binary. It remains unclear to me what those criteria ought to be, but I'm not really trying to force every individual into a binary classification in order to create a unified overarching category of "sex" which takes into account all the various features we associate with sex.
This is generally incorrect. Here is the excerpt from the relevant
wiki:
The
Müllerian system typically regresses the same way it does in unaffected male fetuses due to
anti-Müllerian hormone originating from the
Sertoli cells of the testes. Thus, people with CAIS, despite having a vagina due to androgen insensitivity, are born without fallopian tubes, a
cervix, or a uterus, and the vagina ends "blindly" in a pouch.
Back to my original question:
Which developmental path are CAIS individuals on in utero?
My answer would be both since they end up with (incomplete) features from both, and you can judge a developmental pathway based on results.