For Allstate chorus your district has a predetermined amount of slots. So if you are in district 11 or 12, the number singers going is the same every year.
Honors choir is just a straight score.
At least that’s how it used to be.
Also why honors choir is so much better.

So, from my experience, the schools that send a lot vary from year to year. Our band director is a conductor for it, even though there are only a few students.

Basically, the Junior and Senior class does not have a lot of good musicians. Freshman and sophmore class does. So, I expect that school to climb in these ranking.