Rather than resting on your credentials, I'd prefer some actual evidence of how it has actually hurt the team, especially when you're making claims like 'worst defender in the midfield'.
Very rarely does he let his opponent through in the situations you mention. Nor is it the case that others then need to pick up his man as a result of it which breaks us down further down the chain.
Not sure if you're seriously trying to mount a case that Zaka is the cause of our ball using woes, or just having a passive aggressive dig. Yeah he made some errors last night, but it happens, especially when you're risking moves going into attack.
I like Zaka when he is on song but the thing stopping him from moving towards elite level is his efforts in the area I spoke of. It hurts the team as it allows sides to run forward in numbers at various stages. As I said he is not alone. BJ is close to being as bad and Jobe simply does not have it in his mindset. I can name one form last year that really stood out to start with.In one game Jake Long was yelling at him to cover closer, he did not bother and the ball was switched to the bloke Zaka did not cover and went down the ground for a goal. Now it does not have to be just covering a man. It can be not pushing over and ending up with two players defending one man and one still loose on the outside.
I have not the time to go through the replay again an pinpoint the exact times but I did write down that there where 8 times on a switch of play out of defense that Zaka was the bloke by himself. BJ 7 times, Jobe 7 times and Heppell 5 times. This is not from turn over footy. It was from not working hard enough off the ball or rolling over onto other players. It will never be perfect, sides always get out of position but it is the sides who react the best that are generally the top sides. If Zaka and the others cut that number by half then there is a chance we cut of 10 or so easy inside 50's that put pressure on our defenders.
As a group our midfielders are very poor defenders. The poor turnovers are something we need to work on for sure. You can not win games by giving the ball back over and over.
As for being narrow mined with defense , i would say i am the other way. There are many aspects to defense with many actions to do. With our team defense we try and play the most complicated style that relies on players rolling over onto other players. This is where we fall down as once one bloke does not roll over it fall over. A player may be jogging back 10 meters from a man but he needs to be looking where he is in the defense. We end up with two or three on one because we do not roll out.We do not look or concentrate and a few guys just do not have it in their DNA.
If you looked at the Crows they play a much more simple defense that I think would suite us better. They set up one on one in the back 6 when they can with one loose back to counter the bomb forward. It can come undone but not as easily as the team defense does.
The Eagles tried to build the ultimate team defense as well but now they are not going as well it falls down more often.
Getting back to Zaka, everyone has their weakness. For whatever reason Zaka's is the lack of consistency in the roll over defense. He is not the first bloke I have had a shot at it for. Stants was very much the same. Zack Merritt is not great at it either and the issue is unless you are Judd / Ablett in prime form you can not hide it in a team game.