1) If they are both Mafia, then the Mafia miscalculated, and instead of one person being eliminated, they might end up with two.
2) If Dag is Vader, then it doesn't matter which side he was going to play on, and Yashura is most likely Mafia because, based on the evidence, it's highly probable that we are correct.
3) If Dag is not Vader, but is Mafia or Jabba, then the town has definitely gained an advantage. In the first case, it would have been better to save Yashura, but in the second case, the town might lose a Mafia member and Jabba if Yashura is eliminated (again, because it's unlikely that we misinterpreted the evidence).
4) If Dag is a Town member but not Vader, then Yashura should definitely be eliminated.
Considering the town's and the Mafia's positions, and the greater number of scenarios in which Yashura should be eliminated, I probably won't change my vote.