the supposed post-credits scene
I've seen theories that it will involve Kirby and/or Sidney.
I propose, Mark Kincaid.
It would be perfect. As much as I'd love it if Sidney surprises us in any way, I feel like that would've been a hard secret to keep under wraps. Though that'd be awesome. But if we see Mark get killed, or heck even be a bonus Ghostface, that'd set up 7, without completely guaranteeing or necessitating it. Or even if 7 happened without Sidney, it could be something they could opt to come back to, or even write around. And it would give a perfect connection to Sidney without requiring her to be there. And it'd be a surprise since we haven't actually seen him since 3.
And with that, it's officially time to start being careful about what I look at the next few days.