Yeah the previous information you had was correct. I double checked on Carmen. Troy won both choreo and visuals (showmanship/Music). The confusion above might have just been that Brea won best show design.
Awards given (besides all the best performer per group):
Best Costumes: Brea
Best Female Solo: Brea
Best Male Solo: Troy
Best Show Design: Brea
Best Tech: Brea
This happened last year too, and I guess it just is what it is. Los Al's performance venue is tiny, but they presumably don't want to spend funds to hire a larger space since it's a fundraiser for the program. So in order to let all of the attendees of a particular division watch each other, they just break choirs up into multiple smaller-sized divisions. Not my personal preference, but the competing schools don't seem to mind (one way to look at it is having a 1-out-of-4 chance to take first place instead of 1-out-of-8), so my guess is this particular competition will just continue this way.
That said, it is great to see three whole days of show choir in one place and an opportunity for groups of all different skill levels to perform for an audience.