I went back and reread some of Josef's posts.
So he mentioned both Xad and nana as suspects. nana turned out mafia and some of us are suspicious of Xad. Could be good mafia play to mention a fellow member, especially nana since she was inactive and thus naturally a suspect, so he was merely pointing out the obvious that others had already pointed out. Still it's interesting.
We also have to take into consideration the voters on niichan. Do we seriously think there's not a single mafia in those 5? (Tom/wizzard, Katarina/Hardy, Leonardo/Imperium, Felipe/Farfalla, Mariana-2/Spectrum)
Another factor: nana voted for Hardy. That kind of lessens suspicion on Hardy as she was a mafia. Hardy voted for niichan. I'd say both him and Imp at least are sort of in the clear. I kind of trust Farfalla a bit too, for now. wizzard claimed doctor and no one else has done so yet, so I guess we have to trust him too. That leaves Spec in this group of 5 that killed niichan.
Thoughts?