And then? A helicopter waiting for him on the roof to a jet to take him to some remote island?
If he had managed to get to the Four Seasons, he most likely could have escaped by going down or going into a room, if he had an accomplice.
The Four Seasons has separate elevator banks.
Btw, I think it is a fair assumption that the LVPD is working off of much more information than either you or I are.
I would not dismiss what the police chief has said, just because you have your own theory, based solely on published information.