New footage shows undercover agents watching Crooks set up

It looks to me like 3 undercovers were standing near rally attendees behind building 6 as Crooks got ready and took aim at Trump. These are the same agents seen in other footage a few minutes later by the parking lot. There's even a shot of them walking between the 2 positions.

Stewert clip: https://www.youtube.com/watch?v=28lxF9LONGk
Grimley clip: https://www.youtube.com/watch?v=lk9dN06ilVE