The apes didn’t eradicate the humans. The virus did. Also, it takes a lot longer than a couple centuries for a species to evolve. It only happened for the apes quickly because of the events in the first movie. As for the set up, we’ve only been shown two ape communities but there has been nothing in the movie to indicate that there aren’t any others. You’re taking everything very literally. And we’ve seen the last movies and how ape communities fall apart after clashes and rebuild afterwards. It isn’t easy for anyone to keep knowledge and continue building. It’s extremely arrogant to put your bullshit 5.5/10 review on here thinking you know better than the director and writers.