I'm sure he's been taught it.We are a talent over system team. When talent has a off day we can't rely on a solid system to fall back on. Rayner embodies that mindset and unfortunately the coaching crew around him never taught him accountability.
But perhaps never disciplined him enough to just do it.
To see him wandering around nowhere near the ball without much of a clue is a bit disheartening for someone who can actually play well on his day and there's still time to get him going. If he's up for it.