I would say that Riera is a vital part of our defence too both in terms of screening them and covering for fullbacks when they advance, but also for giving them a secure outlet to pass to if they get pressed in possession by opposition strikers. And I think this year Riera has just seemed less mobile than last year, which has made our backline more vulnerable to counterattacks and pressing. Hopefully it's just him carrying niggles and not his age catching up with him.
I wish there was a touch map, heat map, or average position graphic on the Nix's stats page because I'd be interested to see how our shape has changed this year vs last year, especially the shape of our midfield