Toshio knew that Hitomi and her sisters were Cat's Eye since almost from the very beginning.Whether consciously or subconsciously, Toshio knew the truth from the first chapters onwards. But since he loved Hitomi, he couldn't bring himself to even imagine her being Cat's Eye. Hence all his numerous mistakes while chasing Cat's Eye throughout the series was really him sabotaging his own investigation just so that he wouldn't be put into a situation where he would have to arrest her.
The girls have met Ryo Saeba at some pointTheir cafe appears in City Hunter under a new ownership (as the girls have left for America by then), and Ai once noted that Toshio holding a gun with a serious face looked as cool as City Hunter. Is that enough evidence?
- If the 2019 City Hunter movie is to say anything, yes, yes it is