User blog comment:Kaido King of the Beasts/Chapter 912: A Futile Feudal Life/@comment-32509306-20180720223628/@comment-53539-20180730163549

It was very predictable that all demon swords would appear and there was a chance Zoro would have them all at one stage. This has been a speculation thats existed as long as I've been in the fandom... So 2001 at least. Maybe older since One Piece has been going for so long.