One. Where could shooter have possibly fired from?
Two. Where couldn’t shooter have fired from?
Check all camera footage.
Any person in Bucket #2 is eliminated as a suspect. Any person who could have physically landed in Bucket #1 is a person of interest.
Vet the dogshit out of social media posts re Charlie Kirk in last 30 days. Then 90 days. Then 6 months. See if any match with Bucket #1. If yes, that’s a good candidate for the shooter. If no, vet last 48 hours of anyone in Bucker #1.