Okay, so Cedric Digory being inflated like a character in Sonic the Hedgehog fanart and floating around over the Black Lake while fireworks go off saying "Ron Loves Hermione," causing Cedric to become a Death Eater, is canon?
Yes, but that logic is logical. It's out of character for Ced to become a death eater after what happened to him in the maze, as he's a better person than that. Him becoming a death eater would require situations a lot worse than that to turn him into a death eater.