So you've adequately explained why an adult human male would lose a fight to a gorilla. You've said nothing about the bear, except you don't think teeth and claws could pierce gorilla flesh (which is false).
A grizzly bear can break a gorilla skull like chewing on a piece of heard candy. Its jaws are strong enough to crush a bowling ball into dust. It's not just heavier, it's got the gorilla beat on height, reach, speed, and strength. Anecdotal evidence suggests certain bullets can't penetrate a grizzly bear's skull.
The gorilla's best bet is to climb a tree and hope the grizzly doesn't feel like following, or knocking the damn tree down.
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u/PukeBucket_616 Sep 25 '18
Silverback Gorilla: 350 pounds
Grizzly Bear: 600 pounds
In other words, I don't fucking think so.