I’ve heard the audio as described by an expert, and clearly Crooks fired the first 3 from his position, and almost immediately after, 5 shots were fired from a different position. You can hear the reports and supersonic cracks are interrupted by echoes, meaning there was a metal structure in-between the 2nd shooter and the stage. Crooks was elevated with zero structures between him and the stage. Whoever got to Crooks first after he was killed, planted the extra 5 casings.