I don't understand why up to now people still think Zidane is an "average" manager, they sometimes used to say he's just a "lucky" manager, and yet he did what no coach has done yet in the history of Champion's League.
Yes he had Ronaldo at his disposal but for how long was Ronaldo in Real Madrid? He was there for 9 seasons yet Real Madrid won the UCL only once before Zidane arrived
How many La Liga trophies did Real Madrid win since 2009 before Zidane arrived? Only 1 despite having lots of star players like Ozil, Di maria, Alonso, Kaka playing alongside Ronaldo in the early years.
Now convince me how Zidane didn't have any impact.
Zidane is a good coach but to say he is a great coach, it will cause serious debate. It is same as the debate on Pep Guardiola or Lionel Messi. People say Pep was lucky to take over the Barcelona at the golden time of their players: Messi, Xavi, Iniesta, Busquet, blah blah. They can be right at it but Pep shows his great ability to manage team and it is wrong to say he is an average coach. He did not get Champions League after leave Barcelona and it means he was out of luck or lack of something between good and great coach.
Zidane will only be recognized as great player if he takes a coach position in other clubs and get big success.
Mourinho is different, he got success and failures in some clubs but he is adaptive to many national leagues and left his marks on any leagues he worked in. He is a great coach.