I have this same argument every year with some stubborn, "I-know-better" premed. The vast majority of medical schools publicly state that they require, recommend, or prefer committee letters, a large fraction requiring explanation if you do not have a committee letter, and you choose to ignore the clear intent and obvious partiality that adcoms have towards committee letters. You want proof that an adcom decided against those with individual letters, even letters are confidential and adcom deliberations are confidential,. You are so fearful of what an premed committee would say about you, yet that will be based on the same letters from your campus that you would send to into the committee.
So what you want is validation for your neurotic, fearful and egotistical decision to apply in self-admittedly late, and thus rushed, fashion, to maintain your belief that you will a great applicant and that lacking any absolute, iron-clad, proof to the contrary, your are smugly correct about letters and will ignore the several weaknesses that people here have pointed out. Since evidence is what you want, lets lay out the case in legal fashion it this heavily circumstantial case.
1) From the leading competent authority of in the area, namely AMCAS as the representative of all American medical colleges via AAMC
https://www.staging.aamc.org/initiatives/admissionsinitiative/letters/
Medical schools value committee letters because they provide an integrated and institutional perspective on an applicant’s readiness for medical school. They provide a comprehensive evaluation of applicants based on direct observation and the synthesis of information provided by faculty and others at an institution. This integrated perspective provides unique and valuable information about applicants.
2) So what is a medical school's intent here? Intent legally defined as determination to perform a particular act or to act in a particular manner for a specific reason; an aim or design; a resolution to use a certain means to reach an end. Intent is a mental attitude with which an individual acts, and therefore it cannot ordinarily be directly proved but must be inferred from surrounding facts and circumstances. Intent refers only to the state of mind with which the act is done or omitted. So what in the "intent" of medical schools that require, recommend, or prefer committee letters. It is clear inference that the intent is to have applicants send utilize committee letters
3) The preponderance of evidence, that the majority of medical schools are official listed as preferring committee letters as compiled by the AAMC
https://aamc-orange.global.ssl.fast...d4e1d/msar_medical_school_letter_policies.pdf
Out of 106 schools listed, 70 either require or prefer committee letters or two-thirds of the total