I agree with Bruno here. You essentially he's only playing against 1 player, but that will be the better player of the 2, so his score would have to be better than both of the other 2, so he has to beat 2 players while other people only has to beat 1 which I don't think is fair to Bruno.
Maybe you could have a tiebreaker question for the other 2. First person to answer correctly advances. If both are around at the time of posting of that question anyway
I think that's unfair to 2 people who got 14/15 questions correct in favor of the one who got 5 over walkover... considering that I'm pretty sure that I just sent 15 correct answers for day 2.