maybe it was answered, but look at the youth thing another way...
as said, we have , Sealy, Jones, Scotland, John, Roberts etc(A)...who not avaialble for the upcoming friendlies...so why take a more experienced older player(B), who when the big game comes around, won't be selected because of of the return of our big guns(A), when you can develop a younger talented player(C), who when the big guns(A) move on, in addition to that other experienced player(B), that younger new player(C) would already have the experience of playing at at International level, even if he wasn't utilized in the biggest of games.
It's ah logical solution
Maturana => A=B+C=WC2010 => 4 yrs=>WC2014 =
(.5A +4)+(.5A +4) - (B
+4) + (C
+6)
the variable is Maturana
notes: B or C can stand in for A at present. In 4 years C can replace anybody.
edit: made an error, formula updated