With regard to the under 21s there'll be a whole load of unspoken reasons why some players will be allowed a break. Agents for the likes of Sterling and now Kane won't want to see their brands taking a step backwards. They're too big a name for the under 21s now. Honest guys who just want to play like Ross and Stones who could actually do with a break will get dragged in by the baying media into a group of players where they'll be a class above all of them.
Guarantee now that Sterling, Wilshere, Ox, Kane, Chambers, Shaw etc. will not be at the tournament.