Or you can watch Kimbo Slice vs Dada 5000. Or you can watch Kimo Leopoldo. Or you can watch Tank Abbot. Or even Bob Sapp. Exhaustion doesn't work like that. You can't sudddenly regain your strength when someone is pummeling you. You can't regain strength even if you have breaks between rounds if it's half a minute or so. Not when you have different kind of muscles, and different kind of mass.
You do not go super sayian once you are exhausted. If you are tired as fuck, and someone sits on top of you, even a kid, there won't be anime or movie moment when you suddenly gain strength and shake him or her off.
While this is true, I don't think you can get the necessary weight correctly distributed to kill the gorilla. They have the strength of like 8 men. Even when heavily exhausted, it's bite would be fatal, and it'd be able to harm the humans. I don't think the humans can effectively harm it.
Full exhaustion is different from burst exhaustion, which I think is what people are confusing here. The gorilla is "exhausted" after like 2 minutes of hard fighting. This is a similar exhaustion to a deer being "exhausted" after fleeing. If it rests for a few minutes (which includes walking), it can recuperate enough energy for another burst (shorter, like 1 minute), they can do this like 5 times in relatively short succession before deep ATP reserves are depleted, and they'd need to recover for more than a few minutes.
Human exhaustion is a deeper exhaustion. It takes longer to build up, but also longer to recover. We don't have bursts of recovered strength to fight with really, once we're done, we're done.
People have correctly pointed out that endurance would be the right method of attack, but that endurance comes at a cost of power and recovery time. Humans, due to endurance, lack the power to beat through a gorilla's 2 inch thick skull, or to choke it or collapse it's ribcage without some outside tool use.
If the people "play it smart" and keep back, the gorilla can also keep back, and preserve it's energy, recuperating energy. The humans HAVE to basically throw their bodies into the meat grinder, and I think the gorilla simply wins that fight. Not enough humans are left to do anything to the fully exhausted gorilla.
These are the average human male. They probably have some minor amount of combat experience, but not against animals, and unlikely skilled in unarmed combat against a stronger opponent. Do they even have time to properly strategize enough to figure out how to win? If you don't start from the winning strategy, then many people simply die pointlessly, and the gorilla easily wins.
The men HAVE to start from a winning strategy, which from the various responses of how to do it that I've seen on twitter, the men would just be a cacophony of various tactics, and would get shredded.