DY: Modeh. I didn’t think anyone else could do the Mitzva, but realize you are correct that Avraham Avinu’s Eved is a Bar Chiyuva.
Rambam Milah 2:1
??????, ?????????? ??????: ?????????? ??????? ??????? ??????? ????????? ???????, ????????? ??????? ???? ?????.
Looking at the Rambam in 2:2-2:4, it wouldd seem that even though Priyah is Meakev, Metziza is not (as he just says “??????????? ??????”, not ” ????????? ??? ???”). Is there anyone who holds Metziza is an Ikuv in the Mitzva? Nafka Mina is exactly my point, do you need a Bar Chiyuva to do the Metziza or not?