Balague seems to have negative bias towards Bale but I think it's fair to say Bale and Zidane's relationship wasn't the best.
I'm not saying Zidane doesn't have strengths as a manager but I don't know which young player you can pick out as Zidane's project, or which game Zidane changed tactics mid-game to change the result, or where he has created such positive support from a fanbase (even when they were winning Real Madrid fans were still whistle-pigs).... OGS is doing this currently at Man United. Zidane got his extremely talented players mentally ready for big games and they won. Now we get to see if he's anything more than that.