User blog comment:Kaido King of the Beasts/Chapter 922: Dunking on a Drunk Dragon/@comment-121.45.196.103-20181026082806/@comment-24850639-20181026162311

He was shown to be standing off against Kaido with one of the silhouettes that is either Denjiro or Kawamatsu, so yeah, that should seal the deal.

"Ashura" as you know is a demon, the kanji on the sake bottle he carries means "Heaven". The same kanji is also the middle kanji in the name "Shutenmaru". I'm fairly confident that he changed his name to Shutenmaru from Ashura to symbolize the change he went through as a better man under Oden.