More than one shooter is indicative of a professional hit job. Crooks’ timing was off, he was likely anxious and took his shot before he was supposed to.
I have been pondering that purchase of 50 rounds that morning.
If I had a sighted-in rifle, and bought new ammo, and planned to do ‘surgical’ shooting, I would re-check the zero with the new ammo. Even if it was store-bought, same brand-same load.
But shooter Crooks is not reported to have done that. Any precision sniper would, I believe. PS. Pros would not be running down to the ammo store for purchase; they would have a big stash of factory match, or custom loaded rounds.
A loose-end question from me.