I'm not sure why you're quoting me there because with the exception of the last one your responses don't seem to bear much of a relation to what I said!
So I'll deal with that last point:
You repeatedly say man-marking is more effective but you never explain why, except to say a zonal marker "cannot track the runners as effectively" which is a truism. The aim of zonal marking is not to track the runners, it's to attack the ball. If we fail to deal with the ball coming in, then that's the problem, not the fact we fail to deal with runners.
I would argue that the most effective way of restricting a player's a ability to score is to keep the ball away from them, and I don't see that as an argument in favour of either form of marking really.
The number one priority should be preventing the attacker getting goalside. If you are marking zonally you aren't tracking runners and cannot maximise the chance of being goal side.
As we saw with norwich's excellent chance the attacker got goalside and had a clear cut oppurtunity. If there had have been man marking he would not have had this clear cut oppurtunity.
The primary concern for any defender should be preventing the attacker from having the space to score. If the primary concern is attacking the ball he will decrease the effectiveness of his defence and the defence of the team. Hence giacherrini's goal where Lambert (or rodriguez) left his man flew for the ball missed it and giacherrini got a free header. That is horrendous defending and does not play the percentages. Such an attitude will cost far more points than primarily focusing on shutting down the attackers space.
Unless we win the first ball outright we will be at a significant disadvantage as we saw with the norwich freekcik where there was flickon and norwich players in far too much space.
Zonal marking is probably in most cases more effective at winning the first ball but that is not the most effective way of defending. Man marking is in all circumstances the most effective way of defending as it is the best way of preventing the attacker of having the space to score.
I have to admit Im with rabbit here, although ptf seems to have much more in depth knowledge than me. I've never been a big fan of zonal, stops players being dragged around losing position and inadvertently creating space but needs to be very well organised and difficult to do tight marking.MLT thrived on zonal marking. Personally I don't feel zonal is appropriate for set pieces or in/around the box. But your knowledge seems to surpass mine.