Town needs to be better plain and simple lol.
SK’s having additional roles is fairly common. They basically all have 1 shot BP, so giving an SK a BG is just a variant on that. He could still be role copped as SK when he killed, wouldn’t get a false positive from the hider and could be tracked or watched making kills (or even BG’ing himself on nights when there are targets he should have protected others).
Town didn't have any equivalent to BG, which was very unusual - don't think we had a game in recorded history without something like that.
Even though it's allowed it was one of those situations where I had to weigh my paranoia against a 95% chance that a spade was just a spade. Usually when town questions PR claims under similar circumstances it's a backfire.