I'm not so sure that Xavi does have that extra gear any more, particularly later in the season. Still a supremely gifted player and the best in the world at what he does, but he doesn't seem to get around the pitch quite as quickly these days.
Thiago and Isco are both fabulous players and will do well for Spain, but they've got a long, long way to go before they're anything like as good as Xavi and Iniesta.