https://jrocknews.com/2019/04/hyde-interview-2019.html

X JAPAN has been watching out for a chance to attack the world market, so he [Yoshiki] probably wants to take all possible routes in the approach. Red Swan could be one of those ideas that Yoshiki came up with

Our collaboration on Red Swan was first proposed by Yoshiki over dinner as we had the chance to meet up a few times.

最初からXjapan feat. Hydeの予定だったと