I mean, these are still kids in Gainesville, and about 80-90% of them come from one middle school called Lincoln, the best magnet program in Gainesville. He doesn't really "poach" kids as much as develop the willing ones with his teaching methods while in middle school so they hit the ground running when they hit high school. But the regular Lincoln kids and many other middle schools in Gainesville would feed into Buchholz high school regardless.
The recruiting part actually starts in elementary (there's about 7 different schools in the area):
> Mr. Frazer searches for prospects in elementary school and
steers them to accelerated math classes in middle school.
> Mr. Frazer’s insight was to connect four levels of education: The kids he scouts in elementary school develop in middle school, compete in high school and take specialized classes from college professors that he brings to Buchholz’s campus.
Sounds about right that he'd push them to the same magnet school if it's the only good one in the area.
