Keep a few things in mind:
-DOs have a 70% match rate into ACGME (not too shabby, foreign medical students are around 48% or so without AOA residencies to fall back on)
-ACGME ROADS specialties are harder for DOs to match, on average, for a number of reasons. However, it does happen.
-If someone applies for both an AOA residency and ACGME residency (lets say in Ortho Surg) and matches AOA, then are automatically removed from the ACGME spots. So, and correct me if I'm wrong here somebody, there could have been people gunning for competitive spots - like Ortho again for example - who ranked both MD and DO programs (to be safe), matched a DO program, and were therefore removed from the MD programs, meaning you'll never find them on that posted list, despite the fact that they may have been a qualified, desired candidate for the program.
- As I showed you before ... there are a whole set of AOA residencies only available to DO students. Every Rads, Gas, ENT, PRS, derm, etc, is filled by DOs who finish residency and put up a shingle just like any other MD or DO who went ACGME.
** sorry for any factual blunders or hyperbole in that post ... again, it's hard to sum up so many basics in one post (FAQ and Search ftw

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