User blog comment:KidVegeta/Announcing My Next Story/@comment-111.92.7.102-20101206090953/@comment-3097771-20101207000859

The Yamcha/Dabura episode is definately canon. As the time in which Yamcha receives his scars is not shown, I have a lot of leeway to tell my stories, and it makes sense (after reading the story) why Dabura would be there, at the stame as Yamcha.