I don't think you are truly understanding how the OML works, but I hopefully this helps. Every scholarship applicant who completes the application and gets reviewed by a scholarship board (October, January and March) gets put on the SAME Order of Merit List, based on their final Whole Person Score. It's literally a giant spreadsheet with everyone there, from the highest score to the lowest score.
A certain number of scholarships are handed out in October and January, but the Army holds back a large number of scholarship offers (IDK exact what percentage) until the January board. This makes sense, because a really terrific candidate who doesn't apply until January should NOT be penalized for not applying in October or January. The truth is, and while some ROOs seem to feel applicants should rush to get to the October board, the U.S Army does not run the ROTC national scholarship like an early-decision admissions program at a university. There is really no advantage to applying in October, unless you know you are a dynamite candidate who is very likely to get a scholarship offer sooner, and you just want to be able to make your college plans sooner and/or use that scholarship offer as a bit of extra leverage with admissions. This is why I advise over and over on this forum that the most important thing is to submit your BEST application, NOT your fastest application.
Once the March board has finished reviewing all applications, the OML is FINAL and COMPLETE. At that point, the Army looks at how many scholarships it has remaining and draws a line on the OML spreadsheet. EVERYONE above that cutoff line will receive a 4-year or 3-year scholarship offer. Basically, everyone from a certain point down gets a 4-year, and then everyone below that on down to the cutoff line gets a 3-year. This explains why some kids who were reviewed at the October board but did not get a scholarship then or in the January board do end up getting one in March. It's because their score, while good, simply was not good enough to make the cut in those earlier award rounds.
Make sense?