We are about one week away from this tragedy. There could be a second shooter but I won't believe it until a reputable source provides more information than just recordings of gunshots and some sciencey calculations. If it turns out there was a second shooter, wouldn't it be plausible that the reason we aren't hearing about it yet is law enforcement is doing due diligence before releasing the information?
So, I don't have all the information and don't care to have it, so I'm not certain there wasn't a second shooter. What I'm certain of is that a government cover up is a pretty dumb theory. Why would the govmint cover it up? OK, so, minds like
@ttystikk can do the triple somersault and stick a landing on a mass of conjecture but I can't. The problem with that idea is, multiple levels of government and government agencies are involved: The City of Las Vegas, the State of Nevada, various departments in the federal government agencies. At least several hundred officials are involved in the investigation. A cover up would last only a few days or a couple of weeks at the outside in today's media-world.