Eddy Hall believes that he could do it by himself.
Good luck to him. I think what these guys forget is that the gorilla has nothing to prove. It will bite, rip and pound to defend itself. It's not interested in a bench press contest or trying to find out who can prevail in an arm wrestling contest. It will simply remove the man's head and move on. Oh by the way in the 10 versus one scenario I don't think it's completely unlikely that they would all die.
An unarmed Eddie Hall could not kill a gorilla himself. This is the ego of a strongman with no human equal at the moment.
10 Men I said probably could not do it, but, with proper strategy there is a chance. 100 Men certainly could. In all instances it depends on the rules and scenario. I could apply the "incentive/reward" scenario as well but it is too devious and I don't wish my mind to go down that diabolical angle and just maintain it as a scenario of a straight, honest objective.
If humans can use rocks and other parts of the environment, they can work to exhaust the gorilla fairly easily. That is the biggest weakness I would think is their smaller intellect and inability to run as long as human can. They have powerful short bursts but they can't run for long at all. Once exhausted, the gorilla is far more vulnerable.
So, if you strategize properly and have 10 men and all run in different directions while throwing rocks and sticks and/or are running in circles around the gorilla (a popular tactic in the wild with some pack animals). It will make the gorilla choose one and chase him. He would be the sacrificial lamb in the worst case scenario but if everyone is striking the gorilla if he attacks one, he can't maintain focus for long, he would be forced to protect himself.
The other 9 would attack the gorilla and continue to strike and weave, the more abuse one man takes, the worst off the gorilla is as well as he cannot defend himself from the other 9. Rotate and try and wear down and survive.
One or two could also look to grab the gorillas legs and try and push it off balance, this would place the gorilla at another disadvantage but also jeopardize the lives of these men for the cause.
Think of how a pack of hyenas fight, even lions when they happen to meet. They all circle, when the back of the lion is turned they bite their tail or nip at their ankles etc. This method can wear down any animal.
Now the gorilla is faster and more powerful relative to man so surely some would perish, but if properly motivated and the men are young and fit, the gorilla would probably not defeat even all 10 men who strategize.
If enclosed in say a 30' x 30' room, the mens chances probably decrease substantially.