I still believe our defensive frailties are a team issue, not only defensive line.. casting out Luiz and/or Bosingwa would help only so much, but our pressing and defending further up the pitch must improve. Also, the communication and cohesion between the whole team should be spot on, it's not yet. The team has been told to play more expansive and risky football, which results in considerably more risk passes and ball loss, hence leaving more pressure on the low lines to deal with it, something our team is not very used to but will get used to in time (btw, I believe that was the reason of the high-line too, which by practice showed didn't work). When we talk about the attack, we say it can't exist without a properly functioning midfield... I maintain that the same applies to defence. The best defence is possession and we can't hold it or use it to maximum efficiency, especially when closed down and under pressure and threatened by counter-attacks. When you look at our whole team's organization and placement when we concede, you can see it's a mess, all through from the backline to attack (or top of midfield).