I don't actually think there's 20 slashers.
1. With 4 of the 26 remaining campers roles already revealed that gives us 22 unknown campers. With 2 conmen, 1 psychic, camper jane and Judge Foremen. That gives me 5 spots. That equals 17 remaining spots. Due to the fact that as of this moment in the game there is no basic camper + 7 from the already discovered slashers we can find that there were in fact 24 slashers in the game. This means that instead of there being 4 groups of 5 as we originally thought. There's actually 4 groups of 6. Or 6 groups of 4 but **** doing that.... I think this is right?
I don't know

ignore if wrong.