KC,
I don't think I misinterpreted the results. The event I looked at under amateur multidance competitions was called "Amateur Open American Rhythm (C/R/Sw/B)." The entry form for amateur multidances at OSB also only has the four-dance event.
Incidentally, the the Pro/am Rhythm scholarship was a five-dance event (C/R/Sw/B/M). I don't understand why there's an exception for the amateur division.
Blair