I heard some of the Congressmen's views after their visit to the site but have not seen any of their videos yet. All who spoke said the one big glaring issue as they entered the property was the overwhelming presence of the water tower which was completely unmanned.
One conducted his own experiments shooting with an AR-15 at the same distance and similar conditions and had a positive hit on 15 of 16 shots with the 16th hitting in the ear. I'm not going to go into this that much because I'm a shooter, consider myself a good shot but a head shot over 100 yards isn't going to be as simple as everyone makes it out to be. Prone helps considerably but being pressured by the police which we now know were there in the very moment before he took the shot makes it difficult. Had he been wise, he would have taken a body shot. I've killed a lot of deer over the years but I don't shoot them in the head and the vast majority of them were within 75 yards and I'm using a scope and true high-power rifle. They move, Trump moved, targets don't move. Under existing conditions, I'd say it's a 50/50 chance.
One of the fellows was 70 years old and had no trouble climbing a ladder and walking on the roof, although with all the photos and videos of people on that roof we can stop talking about it being hazardous.