Why Fergie's disciples make average managers

I've been thinking about this, and I think it's the same reason why Fergie himself loved these players.

Lets use someone like Gary Neville as an example - if Sir Alex Ferguson asked him to jump, he's the type of person who would ask how high? I can imagine a control freak like Ferguson, loving this type of personality. Someone willing to do anything and everything he asked, without questioning or challenging his thought process behind it. Even Roy Keane for 99% of United career fell in...

Why Fergie's disciples make average managers