I agree with you about your comparison between Zidane and Guardiola. Zidane has an aura and players respect him more for his achievements as a player himself than as a coach. I know that he won the Champions League three times, but a lot of coincidences have led to that winning streak as well. It wasn't because Real Madrid dominated the Champions League throughout the knockout stages. It was in quite some games the case that they were the team with a little bit more luck than the others. Taking home three titles just like that will probably not happen again anytime soon. Guardiola is a real coach. Nobody talks about him as a player anymore whereas when I remember the name Zidane, I instantly think about him as a genius player, not as the coach who won the title three times.
I think it's because Real Madrid are in a good era, especially in terms of squad depth. Zidane managed to win 3 consecutive Champions League titles because at that time Real Madrid had great players, but he was responsible for the strategy implemented.
No coincidence, but some consider us lucky. Basically there is a lot of effort that Madrid have put in beating opponents and winning titles, but people have taken another route in judging.