Harvard has a graduation rate of 97%. That means that, at very least, 88% of the students in the bottom 25% of Harvard’s accepted students are graduating successfully. Based on the data from the Harvard, 85% of the students who are, academically, at the top 10% of the Harvard applicants are rejected.
So, the success rate of the top 10% of Harvard applicants at admissions is 15%, but the success rate of the bottom 40% of applicants at graduation is 88%.
Ergo - it is MUCH easier to graduate from Harvard than it is to be accepted.
Since, based again on the Harvard lawsuit data, the majority of these bottom 40% of applicants were heavily hooked, it is not even as though they were picked because of hidden intellectual depths which were revealed by the perception of the AOs.