That would've been... weird. I love Stu but him masterminding an attack on Sidney from jail? I could buy that he survived the TV on the head, but he wasn't the brains out of him and Billy, how would he have got out of jail in the first place? But kudos to him, he did think of the idea of Sid's dad killing her then shooting himself.
"Be careful, this is the moment where the supposedly dead killer comes back to life for one last scare"