Okay, I've done some thinking, and I've made up my mind:
VOTE: DSELL
I'm far from sure, but I think Dsell makes the most sense. He had no public relationship with O, they didn't ever vote for the same person, they didn't ever vote for each other. Dsell was squarely in the anti-Jo camp. I believe Dsell is correct, or he's mafia. The thing is, Jo was a great choice to be part of the bandwagon against, because he never got there, so he was always available next round to bandwagon against. And the people voting him got to look smart on Day 1 when they didn't lynch Axxle. If Dsell is is mafia, that means both he and O were safely off the Day 1 mislynch.
Maybe I'm succumbing to WIFOM, but Dsell seems like he is playing a great game. he hasn't raised anybody's ire (except dead Theorel, which might also mean something), everything he says is logical, his votes are logical... Maybe this is just a feeling. I have a bad feeling about him. I can see him being mafia, alongside O, much more than any of the other people, some of whom voted to lynch, one of whom was voted by O... it's down to Jo and Dsell for me. And pops and Glooble are fairly certain that Jo is not mafia. I've suspected Jo all of the first two rounds, and I think I was just plain wrong. There was also some bickering between O and Jo after I said my theory, and also O did vote Jo right when he had self-voted and was about to die.
So I'm down to Dsell here. VOTE: DSELL
By the way, let's say we're right, but that doesn't end the game. Okay, we've got another mafia or Serial Killer or something. If I don't live, you will see that I am town. Do not say, "oh well, he's not SK. Guess there's no SK." Plenty of other people could be the SK, if we have one.