With regards to Zouma, I actually think he was played not because of injuries or suspensions but as a tactical change from Mourinho to counteract Fellaini. I do think we looked far more defensively assured than we have usually looked. Whether that is because of Dier, or Alderweireld or a rejuvenated Walker I don't know.
It's not just on the conceding one goal that I feel we are more solid in defence. It's limiting them to 1 shot on target, having 50% of the possession, having more shots on target than them, same amount of shots and generally not looking like conceding from all of the attacking talent that they had on show. I do agree with you that it would have been better to have done all of our trading by now, but we haven't and the team has not been thrashed. A lot of people would have taken a draw from this game. We were not very far from that at all.