The SECOND SHOOTER? ?????
Recall that Paddock had previously attempted to book rooms at a couple different hotels, adjacent to other outdoor events, I think one even in another state, overlooking a completely different type of concert (not country music).
So it would have been really strange if the security guard at this particular hotel decided to join in on the shooting. In other words, I don’t think it likely that they knew each other before Paddock booked a room there. So how would he even had known what was going to happen? Would Paddock have told him beforehand, total stranger that he likely was? Or would the guy have joined in after the shooting began. In any case, it’s beyond unlikely, IMO.