But, "are you saying that in real world multiple attacker situations, that the attackers will" always "simultaneously attack, all at once from all directions"?
"Always" is an interesting word.... In the real world, "always" can usually be proven wrong.... it only takes one instance to prove "always" wrong. I will say that in the real world, the attackers usually will not wait their turn, they usually will not engage one at a time, waiting to see how their buddy does before they jump in and they usually will attack from behind... as shown in your video.... they came up with that phrase "sucker punch" for a reason.
When training for a real multiple attacker situation, you need to move beyond attackers that wait their turn, and don't attack from behind... Movies, Trigondo and your video very much showed the attackers waiting their turn and not attacking from behind, even when they could have, because the defender turned their back to an attacker.
I'm saying that what you posted, was a choreographed & paid promotion for the US Marine Corp.; otherwise, Gonzaga would've clobbered both of them if it was hard sparring.
Choreographed or not, the Marine video showed attackers not waiting their turn, and attacking from behind. This is more realistic, even if you go with "it is more realistic choreography."
I am not sure why you are so adamant, that this was choreography, and that Gonzaga would win... Gonzaga trains for a sporting match, that is one on one with no weapons. That is a different game. If someone stabs you with a knife, bayonet or machete... your UFC record is not going to save you. The corrections that the Marines offered him were not about his fighting skill or prowess or ability to defeat any one of them in a UFC match. The corrections were about not dancing around like you are sparring, but go kill one, now. Taking a hill in military combat is very different than fighting a sporting match, and requires a different mindset.
UFC guys are not invincible:
Well, maybe Gonzaga is... but he would be the only one. The rest of us mere mortals are vincible.