Yeah fair point.
To be honest, I'm glad that didn't happen though. Hancock being returned to the Celestial Dragons would be disgusting and I'd rather she get a chance to show what she's capable. Koby hasn't proven himself to the point where him beating her off screen would be acceptable. I don't know what Oda is planning to do with the character. There's a lot of hype around him and his portrayal is decent, but he hasn't fought anyone. It's been 4+ years since he returned to the story.
My best guess is that he's around the level of Brook, Franky and Robin. I think a handful of people wank him and are setting themselves up for disappointment. He's not Zoro, Sanji or even Jinbei level. At the same time, I think people that put him on the level of Usopp, Nami or even Chopper are underselling him. He's mastered Rokushiki, has CoA and his CoO was stated to be on an advanced level. He has a 500 million Cross Guild bounty, is considered a Naval Hero, helped make it possible for Blackbeard to oust one of Rocks' crewmates and Garp considers him the future of the Marines. Being on the level of the Mid Trio would be a good place for him to be without being too unrealistic.
Sorry for the long post.