DE, you have a link to support that the 'windows are removable' ? Those look like solid sheets of double-paned thermal coated glass - from the floor to the ceiling of every room. Those things weigh several hundred pounds each. Yeah, professional teams can remove and re-install them - but it takes a long dadburn time to do so. On the order of hours, not a few minutes or seconds. Highly doubt they are removable by guests - would be way too much of a safety issue.
None of the vids of 'other floors' show missing windows - all clearly reflecting surrounding lights. All the vids showing 'other shooters' (claims) are HEAVILY edited to remove evidence that clearly shows there were not - such as, flashes not in any sync whatsoever with the shooting sounds - even accounting for time delays, flames coming out of the barrels NOT seen - (unlike vids that caught the 32nd floor) - evidence of reflections from outside light sources reflecting off the windows.
Also, there's a reason snipers use elevated posts - the higher the better. Especially with auto-fire which is not as accurate. For a crowd, the changes of angle will still have bullets going into the crowd. Go down lower, the same changes of angle result in bullets going short, going high, and a smaller percentage going 'into' the crowd. Simple trig. Not to mention that the 'gravity' trajectory is less the higher one is.
As you pointed out - the guests on other floors DID not report any shooting (except above, at, and right below th 32nd).
Lack of shell casings ?? - I haven't seen panoramic pictures of the 32nd floor suite, nor of the 'snipers nest'.
Suicide is rightly questioned - other shooters in 32nd could have killed him, and left ... long before the cops got there. Hotel security cams - what do the hallway, stairwell, and elevator cams show ? Doubt any of the guest were 'peeking' out their doors to see squat - get their heads blown off if they were.
The investigation will continue -will we get the full story ? I doubt it - expect a lot of the invest. info will be tightly held.
Finally, brethren, whatsoever things are true, whatsoever things are honest, whatsoever things are just, whatsoever things are pure, whatsoever things are lovely, whatsoever things are of good ...