I wouldn't change any of them for him, his role as a lb is very different which is probably why he's so good there. I'd start him ahead of Cancelo every day of the week. I haven't that stats to back this up but I would wager Sterlings ton of goals most of them come with Zinchenko at lb as opposed to Mendy or Cancelo.
He doesn't create overlaps or assists, his job is to recycle the ball, be in the right position to receive the ball and cover the counter. Its no coincidence Grealish came to life 2nd half when Zinchenko came on for Walker after Cancelo was stepping all over his feet and not giving him the ball 1st half. He has this great knack of always being in the right place, doesn't get caught out too often like Cancelo (mainly because he doesn't push too far and is more defensively aware), he's like the anti-Mendy, not blessed with the physique and speed of a fb but really intelligent in making space for the winger and CM (usually Sterling and Gundogan) whilst being solid defensively. Hugely underrated imho because he was less than £2m in a squad that cost £1bn.
Stuff like his record of having the longest winning run in PL history can't be coincidence. We've taken 152 points from a possible 189 with him on the pitch. Thats a win rate of just under 80%. Probably the highest in the leagues history. He's one of those players like Jesus who we're a better team when they play despite their rating as individuals.
https://www.espn.com/soccer/english...enko-unbeaten-in-23grealish-loses-20-straight ironic this is in the Grealish thread given he makes and unexpected appearance but its one example of how much he flies under the radar.
Not to be arrogant but if any of Reguillon, Digne or Tierney were better they'd be at City. For me, he's easily one of the best left backs, again like Ederson he's not gonna fit in everywhere but for Pep he's exactly what he needs and requires in a fullback (usually one of this two fullbacks).