Based on blueoak's post "A possible target could be someone who looked inactive the first night and all the sudden is active." I did a little posting analysis. Using EST, as it's my time zone.
I went through all the current survivors-
drum
chiropteran
storma
jujufish
Elfenix
LightRider
PenguinPower
BlueOak
dustb0wlkid
Zeze
Notably, EVERYONE who is still in the game posted at least once on July 23rd PM.
The evening in which a mafia was afk occured here.
Zeze and Drum were the only two that didn't post anything July 24th AM.
Now, this doesn't absolutely prove anything, but if you are going by the theory that the mafia failed hit was a result of 3 players all being afk over that time period, I'd say there should be a certain level of suspicion towards Zeze and Drum.