That’s utter rubbish b𒁃ecause there are things you have to do as Yasuke that you can’t do with Naoe. Plus some missions include both like “The Fool” end mission. Then there are the people you can only talk to as Yasuke. The side activities you can only do as Yasuke. And you need to level him up just as much as Naoe. There are enemies and missions that you need to do as Yasuke because Naoe will be overrun in seconds no matter how high you have her stats because enemies level up with you. Yasuke is as important as Naoe and there are missions he can’t do because they have to be done by Naoe. That’s why you can’t choose one over the other. So use both.