related, my unpopular opinion: nico robin has already developed CoO and shown that she's really good at it.
- rebecca is proven to have CoO, luffy even says "she is good" at it.
- rebecca shown using her "good" CoO, CAN JUST BARELY REACT in time to dodge Cavendish and avoid a lethal blow to the head
- Robin is confronted by the exact same attack and feels it coming as a shiver and then TOTALLY DISABLES CAVENDISH before he can get close to her. this bitch has extremely good CoO. not future sight but still good