JayMatt19
You do realize that
1. Its not a chiyuv/mitzvah min hatorah to look at the brothers, its only a certain indication of what the child can turn out like, however everyone has bechira and can rise above their nature.
2. There wasnt many families to pick from, Avraham specifically wanted someone from his family and there was nobody with middos like Rivka’s to be found elsewhere.