The guy at my HS would have had highly developed hip flexors/core strength over squats (Glutes/Quads).
That told me his blazing legs came from his core strength & hip flexors. Guys with big squats/deads in the gym couldn’t re-produce his core strength or speed. Funny when people say you get sufficient core development from big lifts.
Do 10-20 planche push ups (Hand placement at the hips), see where you at.