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You can tell he's obsessing over it.
This shows right here why you would not be a good "defender" of the NPOV. He's changing it, so he's obsessive, but people who revert it back are not?
The problem is that you have no standards for your speculation, not that your opponent is a "PoV warrior". You're not even TRYING to reach a consensus on this issue, the first step of which would be to ignore the revert itself and address the issue in a discussion page. As head of the wiki, you should have citations for everything, before you can expect everyone else to do the same.
As for the revert itself, he made it clear as to what his problem was with the text as it stood. He did not think that the game supported the claim that Ishiene was to blame for the assault on humans.