Yeah cos he's shit.
No trophies in 7 years at one of the biggest clubs in the world and a club going rapidly backwards on the pitch.
can't compete in a game thats turned into who has the biggest billionaire (or ridiculously good manager in Fergie)
Most teams approach it by having allocated roles with regard to situations that occur commonly during defending. That is the general backdrop. Then for a day or so they look at video or dossier of the other team and hone that general defensive pattern a bit to suit the next opponent.
I have never in my life heard of a team spending FOUR DAYS ON OPPONENT SPECIFIC DEFENCE, infact when I first heard about it last year I thought it was just a PR stunt by Pards to make him look thorough.
It's the same for attack, there are pitch area specific routines and role allocation (what happens if we do this) and then that is honed to the next opponent for a day or so....
hardly think its unusual to train on opposition weaknesses and how to exploit them, Revie was doing it for Leeds in the 60's