Perhaps his original plan included putting the explosives on the fuel tanks causing a massive explosion and fire and escaping because of Ithe chaos.
My theory is his accomplices got cold feet.
One was to have the vehicle parked in an escape route. Paddock could kid ignite it with a bullet.
Multiple shooters and explosives would have killed 10-20 times as many.
Got news has what they claim is a scoop on this.