No, he's an adult. But if I had permanent Swiss nationality from the age of 5, why would I be changing nationality when I'm called up to the national team at 15? Cox, on the other hand, came up through the English system and was available (but not selected) for the national team, and only asserted his Irish nationality as an adult.
A better example would have been a player who'd naturalised as an adult, like Cacau in Germany.
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