I'd say Vi's the most likely to be the last aiascum at this point. i can see dcl's role being scum for obvious reasons, but i feel like he'd be unlikely to claim it as scum, and i still don't think he makes sense as scum with red.
The thing about targeting quadz is that i
have
seen townies target PGO claims to test them (or at least intend to do it, but get modkilled for an illegal breadcrumb). That was back in DH's mafia on werewolf island. But if DCL's claim is true, then there are abilities that can target crossthread, and if there are abilities that can target crossthread, then the scumkill might be able to target crossthread. Frankly, it's probably the case that either the scum have some other perk/useful role, or that they can target crossthread. There's been a fair amount of town power already claimed and/or killed, considering how many mimics there are, and considering that most power roles are more useful to townies than to scum (i.e., scum mimics aren't that strong).
If LS flips town, then it's safe to assume one of the following:
-there was an uneven initial distribution (i.e., a differing number of scum started in each thread)
-scum can kill cross-thread
-~shenanigans~
I mean, i wouldn't be surprised if he flips town after peregrine did... obviously it's still best to lynch him, but as they say, etc.