User blog comment:DaisyPeachPower/Full Review of All-Stars/@comment-11883116-20160717152532/@comment-4742462-20160717181320

@ArtDraw12, I've heard a rumor that the reason why Owen wasn't in All-Stars was because Scott McCord wasn't willing to voice him for another season. And as for why he did voice him in the finale was because that Cartoon Network (who were the ones to request his cameo) supposedly paid him off.

And considering how Sam got himself eliminated, it felt like they cut and pasted him in all of the scenes that were originally written for Owen because he was the one character at the time who was the most similar to him to some extent.