To a point, the judges aren't judging the fantastic brass sound you're hearing... they are judging CONSISTENCY; of articulation, sound quality, dynamics, inflection, etc... And not only that, but they do it on the field, a place you are not. My thoughts are that the judges heard, at field level, the regiment and devils be more consistent player to player than Crown.
Do I think from the stands that Crown has the best brass section? Sure. At field level, where the Ott is won... not sure.