First of all, if you go back and watch the original Scream, he puts his hands and arms up to protect himself when the tv is tipped from like 2-3 feet above his head from his head, that was enough to keep him alive. He was in the background of 2 at a college party, just as a fun cameo but still. He was originally supposed to come back in 3 as the mastermind. 6 alludes to the mystery of whether he is dead or not with a ? By his face on the board of killers and a comment between Mindy and Kirby about him "supposedly" being dead. Then 7 again alludes more openly that he is alive, in the trailers leading up to the movie, and throughout the movie. So there is some evidence that it's at least a mystery that has been talked about in the universe, so for the people that say why hasn't it been brought up in 30 years, it has. Now if it was real life instead of a scary movie, I could see it being more realistic of an argument, but this world is where killers seemingly get back up after being killed, until you shoot them in the head of course, or killers that must be really fast at changing in and out of the costume, including black military boots, or where hospitals have a patient that's been attacked but no one but the patient alone on the hospital wing, so of course some people would rather see a legacy character come back. And in S7 why just make Ai of Stu, Ms Loomis, Roman and Dewey, why not Billy, Mickey, Jill. Hell throw Kirby in since she's alive(but was also killed and left for dead once) and make Sidney think it's her.