As far as the gun salute– I think we may be missing a key point here.
I don't believe this was an inauguration to a President, but instead to a designatory by POTUS Trump. "A19 gun saluteshall be fired to the flag of the Secretary of State when acting as special foreign representative of the President," per US Navy Flags, Penants, HOnors, Ceremonies and Customs
https://www.secnav.navy.mil/doni/US%20Navy%20Regulations/Chapter%2012%20-%20Flags,%20Pennants,%20Honors,%20Ceremonies%20and%20Customs.pdf
*It's not JUST SoS, but also SECNAV or any other in equivalency. Video attached for sauce. Some of rank that is acting in POTUS' honor receives 19, POTUS receives 21.
Has anyone seen a full clip of the gun salute? Is there an accurate count of 21 or 19? Every clip I have found on youtube is cut off or starts after the initial salute.