Glut Gods isn't Ronin's 'past' exactly but this is the original, canon Ronin Beaufort. The Ronin in KC is similar with his past with Ther and Angelwood and all that but he is a different Ronin. Kind of like an alternate universe version of him where he isnt as unhinged, Ther is dead, is more toned down with the TW's and satanic shit in general. You can check out Ronin's page on Fandom Wiki for an image which has a comparison on the two characters which I'm pretty sure Rose made themselves!