Your post got me thinking about a few things.
First, Chambers being 3rd choice at RB, I'm not sure how much time is he gonna get this season, he can play CB - 3 players in front of him, RB - 2 players, defensive mid - at least 2/3 players.
Also, IF at least 1/3 of our most talented youngsters develop how they should, I believe we might have goalkeeper, both wings and a defensive/central/attacking mid positions covered (maybe even a striker, but backup more likely) for odd 10 years. Of course, it's a big if, but there's serious competition in some positions.