[Achilles]

Why did Christopher not choose Mark for most loyal and trustworthy? Mark is much closer to Christopher than either Helen or Winston, it's a no brainer. If he did it because he was giving "fair" answers like he claimed, then why did he vote Mark as the most likely to win? He knows that is BS, especially with Winston stood there and the negative feedback about Mark from the public. The reason he didn't choose Mark was to get the reaction from Mark. He know the public will side with him after the inevitable argument, just like they have done for the past few weeks.
Helen had every right to take Mark's side, not just because he is her friend but as an objective outsider too.