If Roberto was 1v1 vs Machis, then Mingueza and Pique were 2v0. Even though they were further back, didn't run up and down the flank the whole game, and the ball appears in the central corridor just outside the penalty box after Minguezas mistake, you say that it's Roberto who should be blamed for not being first on that ball in that situation...
Roberto should tell or be told that Mingueza should follow that run from the start.
He was the same 2 steps behind that player the entire time, and had to stop in order not to foul him after he picked up the loose ball from Mingueza, and intelligently had his first touch outwards. Your lines are a bit fucked up, the angle was such that you can't find any player that would be first on that ball from that position.
Mate, no offense, but you don't understand how zonal defense works.
ZONAL DEFENSE means you defend the zone, not the player. And you only take on players when they arrive in your zone. It's simple really, Pique and Mingueza have no player in their zone, so this is why they are marking no one. Roberto has one, and is owned by that one player with absolute ease. He's right next to him and can't hold on in the duel, the Granada player smokes him for pace and explosion on the first 10 meters. It's that simple. A faster player simply hangs on in the duel and blocks Machis before he gets to take a shot. Because Roberto has no pace, he is nonexistent in the duel. His positioning is bad as well.
There are up to 4 errors in that play.
Umtiti - for breaking shape, going to intercept/press, and failing abysmally while letting the Granada player pass the ball freely
Mingueza - for failing to get a firmer touch on that ball and clear the danger
Roberto - for losing his marker easily
Stegen - for doing his usual handball dive, not using his hands at all, which is near useless in football
I'm acknowledging Mingueza's error and did this from the start. You are the one saying stupid things like Mingueza Pique are 2 vs 0, just to excuse Roberto because he was terrible individually there.
The player was handed to Roberto when Umtiti made a move, and Pique + Mingueza covered his absence. This means they transition in 4 at the back (because Umtiti is basically in a DM position, well off from his backline spot). As a result, the duel is clearly assumed by Roberto from the start, it's just that he is weak 1 vs 1 and everyone with pace can beat him fairly easy.