I see. One possibility (however outlandish):

1. The shooter was trauma trained to get on the roof.
2. He was observing CK and his entourage from prone position
3. He was trauma trained to look out for three signs: --a-- The hat tip face toucher in white --b-- The arm slider guy in black --c-- The shoot-shoot-shooter man in white
4. He is to take the shot on the first jolt of shooter man
5. All this is trauma trained into him (thats a whole year operation with fake boyfriend, drugs, abductions, hypnosis, trauma events, gaslighting etc)
6. He is on the roof, thinks he has a rifle (he doesn’t, he has a screwdriver and towel)
7. He is hypnotises and takes the shot as he sees the sequence
8. Real shooter shoots on the second shot of shoot-shoot-shooter man in white (he is faster to the trigger, and the delay from patsy shot gives him time to refocus his eyes so he sees the shot land in focus, which further deepens his trance, and conviction all is real)
9. Patsy runs for his life with his towel and screw driver, thinking it's a rifle, because he is under "hypnosis"
10. Goes to forest, drapes towel over rifle, as per installed script, rifle was left there prior by handlers.
11. Concealed real shooter leaves under cover of arranged distractions, secreting rifle for later collection
12. Patsy goes home, thinking he took the shot, which he saw land, he took the shot in his mind.
13. Run confession programme - patsy in dreamlike state "implies" he might have done the crime
14. Rifle was planted in forest, recently fired for realism. Now draped in towel with patsy DNA
15. Screwdriver is sized to be take-apart tool for rifle, hence nobody saw rifle when he escaped (towel is for plausible rifle on video), he "dismantled" it with screwdriver.
16. Screwdriver has DNA, Rifle was used in Patsy abduction-trauma training and also has DNA
17. Perfect crime - guaranteed shot on target, guaranteed patsy. They use trans aligned because they are already willing to warp reality and defiantly live in that false reality, self-selecting for "Manchurian" duties.
18. Oh no, what have I done, this accounts for everything.