What a career Zidane has had!!!!!!! No wonder he just had to resign, there is nothing left to achieve.
He has achieved EVERYTHING, I mean KILA KITU that could be achieved in the football world both as player and manager.......and he is only 45.
Hans Gruber from Die Hard (1988): "'And when Alexander saw the breadth of his domain, he wept...for there were no more worlds to conquer.'
Zidane must have realized, it can only go down from here, so he quit at the top.