I've been re-reading the thread, and try as I might, I can't come up with any pairings that make sense in my head. I'm also thinking that, much like the bomb, the 1UP was simply handed out via RNG from the GM. Sorta like items just dropping into play in Smash Bros. Looking at ChopBam from that perspective, and with no logical partner, the case on him being scum more or less crumbles to dust. So then, I start thinking, if it's a lone scum, who could it be?
FRAYDO? No, because he's opened masonries with iLikeToSnipe and ChopBam. Most important was his N3 masonry, which means he couldn't have done the nightkill.
ChopBam? No, because he roleblocked Louis on N3.
iLikeToSnipe? Possible, but highly unlikely. You could make an argument based on the idea that his Mask action is technically an item action rather than a regular action (which would allow him to use the Mask and kill at the same time), but then you consider the fact that he used the Wind Waker. Why would he do this and not try to make a kill? Unless the kill was redirected to him (where I definitely don't think it would land), and he anticipated ChopBam destroying the mask, so he could use that as an excuse as to why there was no Mask activity... I'll have to think on this one a little bit more.
Myself? No, because I masoned with FRAYDO N2 and boosted him N3.
Mojoman? No, because he roleblocked Shade N1.
Louis? No, because she was roleblocked N3.
This is, of course, assuming that there's only one scum left. There is a possibility for a team, but I don't think we'll find evidence of them colluding in the thread. If a team does exist, then there's been some bussing here and there.