He used to be a right bully at Home Farm in the old days, but there's hardly anyone left in Emmerdale who would remember any of that, apart from perhaps Betty and Eric...... but he's long since calmed down.
Stuart Blackburn could quite easily have chucked that statement in as a red herring, so that we all think it will be Cameron, Carl or even Cain. If there's anyone whose list of crimes and misdemeanours is longer than a teenager's bucket list, it's Cain, and yet I doubt very much they'd off him....... if they bump Carl off they'll leave sooooo much history unfinished....... Cameron is perhaps more likely, and yet he only really has one misdemeanour racked up, it pales into insignificance next to Carl and Cain's atrocious pasts....... who else could be described as "had it coming"? Val? Apart from her thieving past and general unpleasantness recently, her only real "crime" has been to return from Spain as a crazy woman. Jai and Robbie are also off the list, as they also mentioned "well-loved character" and neither of them really fit that. Eric Pollard? He's been an evil so-and-so over the years, everyone thought he killed his ex-wife (he didn't though) and although recently he's been pretty emasculated he definitely has a murky past.
Most of the cast seem to be unaware too, if they are telling the truth - Matthew Wolfenden and Charley Webb commented that their scripts haven't given them a single clue about the upcoming death. Still, they're probably just saying that