I've heard different scenarios. Agreed there are lots of questions such as the body being staged and the shooter didn't commit suicide but was shot. Were to believe he laid down and then shot himself.
I agree on the spent brass. If he shot from the one window facing the front of the hotel the spent brass would have ejected out of the room since the shooter would be angled to the target. But the corner room should be filled with spent shell casings since the shooter would be shooting almost straight on to the target. The biggest problem is the lack of barrel flashes in the video's of the identified rooms. I haven't seen one barrel flash from these rooms in any video.