They aren't checking cards, they are checking the challenge/offence to ensure a sending off offence hasn't been missed.
They look at all challenges (in theory, this include those second yellows that result in a red) in case it should be a straight red. (A red for two yellow cards is a one game...
I rarely ever listen to the TV commentary.
Ben White was just holding his groiin like he'd pulled something (oo-er!), could be a weakness in Arsenal's defensive line, unless it was a temporary twinge.
C'mon guys. Let's be fair. Chelsea were so desperate, they have rushed him into the team before his hamstring has fully healed. Let's see how he gets on when he's fully fit.
Onana collides with the Wovles player and is not punished, not even by VAR. Everyone says it is wrong. This isn't one of those cases were the officials are arguing it is a subjective call and both were some how right. Every ref that provides punditry has said it was wrong. The PGMOL admitted it...