So you believe the FBI but not people who were there?
I have seen and witnessed the government/media twist/cover up stories before so it certainly wouldn’t surprise me. At first I believed the lone evil genius theory.
Then I read multiple first hand witness accounts and listened to and read the transcripts from the police scanners that night. I believe there were other shooters that night at various locations.
Several video’s available here, https://www.intellihub.com/new-vegas-footage-shows-manhunt-underway-at-tropicana-ave-and-the-blvd/
There are *always* unreliable live reports when something like this is going on. Any one individual is seeing only a small piece of it, and there is panic. When you don't know what's happening then everything is suspicious. Look at any similar event and you see the same kind of wild rumors while it's happening. You should learn to expect that and realize that most of it won't pan out.
Should you believe the wild unreliable panicked live reports, or the results of careful after the fact investigation? A rational person knows the answer to that one.