Well Tapie actually it's kind of a funny story (oh no wait it isn't).
Deschacht is simply one of the drama's of belgian football.
This is a guy that can absolutely do nothing. If he would've been playing for Westerlo or Lierse he probably would have been going through a pretty anonymous carreer.
This guy can do absolutely nothing. His technique is below average, his defensive skills are very moderate and in offensive way he brings really nothing to the team.
Deschacht is this rich boy, that came out of the Anderlecht-reserves (where he never stood out) that was brought into their team because they had nobody else. And that's pretty much how his carreer is been going on so far.
Van Der Heyden used to be this quite skillfull attacking left-winger that Club Brugge found at Eendracht Aalst. They bought him and somebody suddenly came with this brilliant idea: "you know what? What if we just place this guy on the left-back? He's not a real defender and out of Belgium any average opposition player can show him every corner of the pitch but in the belgian league he should suffit"
Offensively Van Der Heyden can bring something to the team but defensively he ussually is very poor. If this is CM I would give him a 5 (on the score of 20) for positioning a 5 for marking and a 5 for tackling.
Daems is not always a regular for B.Munchengladbach and Leonard is a bit old and has the reputation of being a trouble-maker.
The only real solution there is IMO is lining up Van Damme. But somehow AA thought it was necesairy the past games to place Van Damme (who's a left-back and has always been one) on the midfield.
Anyway in short: Belgium is filled with foreign or simply sh*t left-backs. Descacht is very bad but simply the only sollution because he plays for a 'big' team.