Wait a second, unless I was mis-informed while applying (which is definitely possible), I was told you have to choose either the DO or MD match prior to applying to ERAS. Otherwise, as stated above, if you do the DO match, you are obligated to accept an offer if that is given to you. [\QUOTE]
I actually know of a few DO students who did a prematch contract with an ACGME program, but that was a few years ago. When I recently asked about it, my dean assured me that was not allowed, which was my perception.
Anyways bblue is correct, we can only participate in one match. Perhaps these students interviewed for both AOA and ACGME positions only to decide they wanted to match with an osteopathic program. From what I understand the AOA match is earlier than the NRMP. I guess those students would appear to 'disappear' from the list at that point.
Tell me if I'm wrong, I'm always learning