If all scum were zombies, Lalight's brain would have been eaten.
If more than one scum was on the zombie team, would they not have split their attempts though night-time communication? So rather than "not all scum are zombies", it sort of points to "no more than one scum zombie". Though I say "sort of points to" because I assume there could be other mechanisms at play, like someone being able to block brain-eating or something.
concept from the other side here. Town Zombies...
You get +1 if it is a shared faction according to the set up. so, they flipped town... so that is +1 if you are a town zombie.
You get +1 if you ended the day not voting for LL
Really, I guess the only town negative points would be; -1 for taking another night action.
But still that puts a town zombie at +1 (with a night action) on eating LL's brain if they were not on the wagon.
Skum Zombie could get..
+1 for not being on wagon
+.5 if you are not town aligned
Then the same -1 for taking a night action.
So if skum thinks there is town zombies, then it wouldn't really make sense for them to try to eat LL's brain if they took a night action.
Alternatively, if there are town zombies who assume there are skum zombies... it would make like zero sense for them to not eat LL's brain if they were off LL's wagon.
The only thing I can think of is that a town zombie was so convinced that skum was 100% off LL that they didn't even bother? But I do not see how that is possible.
Like there is no noted downside to trying and failing as opposed to not trying at all. So, since LL's brain is not gone, I assume that there is a blocking mechanic in play.