User blog comment:The ASL Pirates/Traveling Back/@comment-10543621-20150720063525/@comment-10543621-20150721044411

Yeah precisely. Could have been more than 4 that's for sure. But assuming it was still Yonkou even back in that time, aside from Roger, Whitebeard and Shiki, for one thing, we have no idea how 'senior' either big mom and Kaido are. For all we know, they could have been active and strong even back in Roger's time. Could be either one of them.