I agree with Rossi here (although not sure if you meant I was on your ignore list or Billyiddo after that previous post...so I hope this gets seen!)
Our defence isn't as bad as you are making out. BAE is left to do the defensive duty for often the entire left flank considering Bale is told to take a position high up the pitch and wait for the counter. Lennon tends to track back slightly more but Walker is fairly similar as a defender to BAE, they are both good at recovery and good one on one. Kaboul is good for us in terms of keeping possession and quick so we can play the high line. But you don't like any of them. Maybe they aren't the type of defenders you want if you are planning to play a defensive game with the team behind the ball for long periods (although on the rare times we did play like that last season - Chelsea away - we deserved to win) but they are good for our system.
You seem to value certain types of defenders and consider different types as not good enough, even though they are really just different types. I used to be the same with all players. I used to think Carrick-type passers were the only players worth having and any other players were brick if they didn't fit that mould. But really if players have reached that elite level and they are getting picked every week, you know in some way they are doing a good job. Particularly if it is someone like Harry picking them, who wouldn't be shy about benching and replacing players he thought were rubbish.