If a previously-roof-positioned LE was stationed on that roof "before getting too hot," wouldn't the counter-snipers have notice that the earlier one was wearing standard LE gear while Crooks wore cargo shorts and a T-shirt?
Did the guy who got too hot to want to keep his job also have long, flowing brown hair?
Surely an AR-15 without a big scope and expensive range finder is not a standard counter-sniper weapon! (The counter-snipers on the buildings behind where PDJT would speak would have been able to see such weapon characteristics.)
I also wonder whether that apparently-transparent jug that we see in the lower picture (near Crooks or closer to the phone camera?) was brought by Crooks and where it might have gone subsequently. I've not heard anyone talk about it.