My hypothesis is the first 3 rounds are from Crooks. 4-5-6-7 have a different sound signature and are MUCH MUCH more rapid.
Second shooter heard the lull or stoppage by Crooks from his window position and opened up.
The fact that Cheatle would not even say how many spent shell casings were on the roof is DAMNING. An AR-15 ejects to the right, all casings would be on the nearly-flat roof.
If it was on the up-and-up, we would have seen high-res photos of the body on the roof, (not just the face), blood trails, the rifle, and every spent shell casing. The FBI hosing off the roof and nearby windows is also damning.
Note Mike suggests the closely timed sequence of shots following the initial 3 shots could suggest that there were two snippers working in tandem at the second floor window location, each shooting almost simultaneously at Trump once Crooks got close with his shot, but failed miserably. Then panic set in. Obviously, after those first three shots Trump was already down on the stage floor. The number of rounds fired subsequently suggests the assassins disbelief, utter determination, and frustration that their attempt was coming unglued. The crazy bastards just keep on shooting. Cheatle would not discuss shell casings because those details would start unraveling the ‘one shooter’ BS story.
Some say that the first shot was a bad one because it missed, so how could a trained sniper be such a poor shot. In truth, the first shot came within a fraction of an inch of hitting Trump in the temple, and missed only because Trump suddenly turned and tilted his head. It was, but for that unexpected movement, an excellent shot.