You really think this has been so uncovered, I have a simple question for you. What time did staff at Mandalay Bay contact police, via 911 or other means and tell them they had a shooter?
at whatever time the minimum wage security guard, or the slighly more than minimum wage desk clerk, or graveyard shift lobby manager picked up the phone and made the call.
you tell me why it matters in the grand scheme of things, and I promise I will crawl out on the ledge with you.