He’s not really a genius. In fact it’s kind of out of nowhere. Though it has been stated that One For All is a power that is passed down, what powers were passed down were never said. It has only been shown and implied that strong physical and mental prowess was the outcome of the source. But these new quirks were never talked about. Not to mention there are 6 other quirks still left to be discovered, let alone mastered. I just really hope this doesn’t turn into One Piece and still continue 10 years later.