While I agree, it does seem quite consistent that he is caught quite far forward, without much effort to get back. It's something I've noticed last few games, and has been highlighted by MoTD/Sky live games etc.
I wonder if it's best suited for him to play the Milner role and put walker at full back.
i would like to see this. he seems to think he is a winger as it is, and is often further forward than milner. walker gets forward too but he always gets back because he is very quick. i know johnson is no slouch but he doesn't get back to where he should be as much as he should.