ISIS and Las Vegas?

When I first heard of this tragedy and the circumstances surrounding it, nothing added up.  How one lone gunman could enter into a hotel carrying an arsenal and ammunition without being seen, noted, or even appearing as odd seemed quite impossible.  The arsenal that the shooter had been described as having in the hotel room would have been very heavy, very cumbersome, and very, very suspect, even if those firearms had been carried in closed bags.  The ammo would have been impossible to lug through the lobby, into an elevator, down a hallway, and into a room and this would have been recorded via security surveillance footage - this was, after all, Las Vegas where there is an "Eye In The Sky" everywhere one goes, including hotel elevators, hallways, and stairwells.

Even if there is the slightest doubt, eyewitness statements would support any theory that there wasn't a lone gunman.  Phones were confiscated and wiped clean of all images and video recordings.  Think about this implications of this if ISIS did, indeed, have a hand in this horrific event.  The implications are staggering

https://www.youtube.com/watch?v=3AITK0w-jNI