who will the killer(s) be?

My guess is they'll go back to a classic duo team. 3 and 6 both messed around with that, which is fine, but 2 is generally it. I think it'd be wild if one of them was Tara's dad, wanting to kill Sam for ruining their family. Heck maybe even their mom too.

I also think Danny would be an interesting choice. When we saw him in 6, he was still establishing himself as part of the friend group, his plan is in its early stages. Similar to Richie's family killing the film students so that they could be the ones to kill the Carpenter sisters, it's a case of "Oh no you don't, they're mine!" I think that'd be a good twist.

Or really even Chad and/or Mindy. The motive could be that Sidney/Sam always gets the attention, now it's Randy's turn.