I think the problem we got is M4yhem is 100% scum, where as Yos in my eyes is 95% scum by that I mean.
M4yhem is either Alien and telling the truth with regards his intended kill last night.
or
M4yhem is Borg and claiming Alien in a bid to get us to lynch Yos.
If it's the latter then there is an element of doubt over Yos, which means he could still be a townie. The Borg could have targeted Yos at any stage whilst the Worf role was alive, thus thinking he may be in the opposite group but actually a townie, this is unlikely but still possible considering the lack of kills. It is as likely as the two groups taking down the same player twice in the game.
Night 1 - Twito was killed. The possible outcomes here are Borg killed and Alien targeted Borg. Alien killed and Borg targeted Alien. Alien and Borg both killed Twito. Borg killed and Alien targeted person Worf protected. Alien killed and Borg targeted person Worf protected. I think it's even more unlikely LG - the Worf blocked the killer, mind it's still possible.
Night 2 - Smashy was killed. The same theories apply here as they did to Twito as LG is alive.
Night 3 - Fircoal was killed. Outcomes here are Borg killed and Alien hit a Borg, Alien killed and Borg hit an Alien, Both scum groups hit Fircoal, M4yhem did press Fircoal hard that day aswell similar to Yos pushing LG the previous day.
Night 4 - Jack was killed. Borg obviously killed him, whether Jack was the earlier blocked hit I'm unsure of, no one seems to have fingered Jack much during the game, mind we've had so many quick wagons, the scum haven't had to work hard to blend in. Alien either didn't send hit in extremely unlikely or targeted a Borg, very likely.
To summarise I think there's way to much doubt on Yos compared to M4yehm. It's easy for M4yhem to come out and claim Alien straight off and claim a guilty on Yos, he wasn't under a great deal pressure, what one vote? The Borg and Aliens are both pretty much going to know the Aliens hit a Borg last night but it's just as possible that M4yehm was aware of Yos being supposed scum from Night 1, if they targeted him then, chances are he may have had Worf protection. The scum group would then assume Yos as being a rival scum. Anyway I'm rambling but I'm 100% M4yhem is scum and probably 70% he is Borg. Yos I'd say is probably 65% Alien, 30% Borg and 5% Town. Being as I'm more sure of M4yhem I think he's the probable Borg.
vote m4yhem