Walker was a huge part of why England defended against counters so effectively at this tourney. Almost like a sweeper with his greater mobility, he cleaned up enough dangerous throughballs that would've probably been goals for me to rate his tourney ahead of Shaw's, despite Shaw's superior contributions going forward & strong defensive showing in his own role.
The germany game is the only one I've rewatched, so that may be warping my impression of his tourney on the whole, but he cut out a handful of balls that had a good chance of turning into the 1-0 for us, had Walker not been back there.