Were there broken windows other than the 32d floor?
Not sure yet. several photos show some at the 4-6th floors-—but other people say those are on the wrong side.
Doesn't necessarily need to be if what these reviewers are saying is true:
"Mandalay Bay was Disappointing
Posted Aug 17, 2015 on Hotels
The floor to ceiling windows whistled loudly whenever the wind was blowing in the right direction. Adjusting the vent on the window did not help."
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5/11/2010 - The vent on our window was broken so majority of our stay our room was noisy from the wind and outside noise."
https://www.yelp.com/biz/mandalay-bay-resort-and-casino-las-vegas?hrid=XMTQEHB5rr5SsJPpOxCi4A
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"Mandalay Bay also has those little "ventilation strips" that you can slide open".
Mar 06, 2008
https://www.tripadvisor.com/ShowTopic-g45963-i10-k1793764-o10-Windows_opening_do_any_strip_hotels_have_windows_that_open-Las_Vegas_Nevada.html
It appears there may be some guest rooms at Mandalay Bay (lower level??) that have some kind of window vent. If true, could be used as a gun port, basically, without having to bust out the window. Not saying there was a 2nd shooter, just and observation.