> Grades and SAT scores are only one factor of many that are used in admissions decisions.

The other factors were added specifically in order to give universities leeway to massage the demographics of the incoming class. IIRC this kind of holistic admission was invented specifically to be able to reject Jewish applicants who tended to be academically strong but less "well rounded" than WASPs. So ivies effectively put a cap on the Jewish quotient by creating the holistic system.