Just a painful watch now. Sub made sense, ake still not fit, 4-0 up, walker should be able to cope fine but he couldn't even get the basic stuff right, it's things like simple passes not having even close to the right weight in them over and over that cannot be excused. That's not age catching up with him.
Best thing all round would be for him to move on this window and we get a replacement in, nobody wants to see him struggling like this everytime he steps on the pitch, it's going to tarnish his legacy here. Go get yourself a Saudi payday.