He doesn't have to build a team. Nor is his intent in the past 2 years on doing so. He didn't come back to scrap 66% of the players and build anew, nor was the president able to OK such an endavour.
What he's doing is small changes in phasing out older core and in all but one case it works. It applies to everyone but one distinct player. And it's only that one player for whom there is no explanation as to why he's not being used less when not impactful. And if less impactful, impact needs to come from somewhere else. He cannot expect anywhere near the desired return from 20 year olds who barely sniffed European football, so we waited for Asensio and bought Hazard. They're not available tonight though. Which creates a problem because what's he supposed to do. Choice was either - force younger players to make improvement, or figure out an alternative formation to shift the dynamic which doesn't put wingers at centre of production.
He chooses to do the former.
Inexplicable.
I am not sure it has worked at all to be frank.
The fact that you won last LaLiga says something, but not that Zidane succeeded in phasing out and in players.
Rotations, which he does well, does not mean phasing in or out. You have to see what he does in big games and in 60% of other games.
If, apart from Benzema, Modric, Kroos, Casemiro, Carvahal, Varane, Ramos all play those games, he has not phased out players.
I will give him Fede Valverde and Mendy as the only two he has managed to phase in and Marcelo the only one he has managed to phase out (with question-marks if both of the former two have the quality to be long-term starters for Madrid)
But that's pretty much it...
Hazard plays when he is available, and Vinicius, Rodrygo are part of the rotational plugging of holes when others are injured or for the other 40% of games.
Ok, maybe my bias is talking now, but Zidane is not the man for the job (although I came to rate him a bit more after last season).
Look at how he lets (and has let in the past) reguilon, hakimi, kovasic and others go.
He is not comfortable with non-established players.