Board Thread:Questions and Answers/@comment-27802108-20160219071545/@comment-26409128-20160226124916

I also believe that Eto wasn't serious. She was established as one of the strongest characters in the series since nearly the beginning so it would be a bit too easy to defeat her just like that. Also it would really be a big coincidence if everything went according to her plan even though she went out of control.

Putting that aside. We don't really know exactly how strong Kaneki is at the moment. But Eto isn't the only SSS rank either so it doesn't have to be based on her alone. Yoshimura is, too. And he isn't as strong as his daughter but still strong enough to be considered SSS.