Without the postponed game on the 28th of December, City would have still had a 5 day rest. All City got was 2 extra days and avoid the 2 games in 48 hours against a depleted Everton, who then lost their next game. The lack of class from Klopp here, is that he has no sympathy for the concern and disruption the outbreak itself caused. The training ground had to be closed down for a deep clean, as well as losing the players who had to isolate for the next game. I'm pretty sure City would have much preferred that there was no outbreak at all, a 5 day rest was coming and Everton's loss in the following game suggests it might have been a good time to play them.