I hope you understand that if he's not the Mafia, then you are?;)
I don't mind looking through the archive of the voting analysis.
There was obvious evidence against Ovn on day 1; he went into the night phase, and then you added him last, while Ovn and Olam went into the night phase at the very end.
When it was between Heroist and Revan, they took turns being targeted, then they started targeting Revan, and then they focused on Heroist, whom Ovn was so fiercely defending, which was a clear sign.
There are reasons to suspect that Ovn is likely the Mafia.