John Cullen threw a lot at the wall and only a minimum was relatively close to possible. I would not waste time looking into anything Cullen purposes.
...Maxwell Yearick was in U crane and paraded himself around the rally to be seen. He looked like Crooks and was to set Crooks up as a patsy. He was supposed to get away. Greg Nicol, a Beaver County State Police Officer was alone on the second floor of the AGR inc. building and took the last pictures of Yearick before the attempt. When Yearick started across the roof Nicol moved to the glaringly obvious second story window that faces directly toward Trump, which John Cullen in all his awesome perceptiveness can't seem to find, and from there Nicol took the ear shot. Yearick who was only there for setting up the patsy rattled of some shots until another PA trooper pulled up his rifle and shot Yearick's gun. A few seconds later a state trooper sniper from the West grandstand roof capped Yearick even though he had no permission to engage... Nicol and his wife, who was part of the medical personnel of Greg's unit, were two of the first three on the roof to examine the body and probably spread spent brass.

Cullen never considered Nicol, that window, Maxwell Yearick, or Mrs. Nicol... He is either intentionally miss leading people or not very good at noticing things.