Flick system isn't really a true double Pivot, so it might not fit him as well as we thought.
Casado/bernal sat as the single pivot most games, which is the position he's likely to play and has been constantly horrible at.
While pedri plays more of a CM/AM, and he's now very good at the AM side of things, lacks pedri's gifts in tight spaces.
Im double Pivot that fits him, he's more a Deep lying playmaker, and we don't play like that now.
But either way we still need his body.