Yishmael’s Bris was rational and that is a liability compared with Yitzchok’s super-rational bond. It is the basis of the Jewish people and that they are a miraculous people attached to Hashem higher than reason, from infancy.

Avrohom looked so much closer to Yishmael. In fact Yishmael did Teshuva during his father’s lifetime, while Aisav seemed so evil. Under the surface however, Yitzchok’s connection to Aisav is limitless (he was a Jew, only a sinner) while Yishmael’s relationship to Avrohom was on the outside only. This reflected the difference between who Avrohom…