However, the Asturian coach says Barca's Lionel Messi is still the best player in the world.
Croatia could do little to stop the Spanish onslaught as the World Cup finalists suffered their worst ever defeat in team history.
Atletico Madrid's Saul Niguez put the hosts in front in the 24th minute which was followed by two quick goals, both scored by Marco Asensio, but one of them was later ruled as an own goal from the Croatian keeper.
It is 16 years since Madrid had six players in the Spain team as happened against Croatia while Barcelona, whose players were the mainstay of the Spain side during their recent golden period had just Sergio Busquets starting.
That counted as one of four assists for Asensio on the night, with a more conventional one coming four minutes after the restart when he released Rodrigo who nutmegged Kalinic for his fourth goal in six starts for his country.
Spain have rattled in the goals against Croatia to take charge of their Nations League group.
Asensio takes advice from Zidane. Image PA Images
What does it mean?
More importantly, they are off to a winning start under Luis Enrique, with their performances in Elche and against England at Wembley a stark reminder of the quality they possess, which seemed to go missing in their tempestuous World Cup campaign.
Spain will host Croatia at Elche's Estadio Manuel Martinez Valero on Tuesday as the UEFA Nations League competition continues.
The centre-back was consistently excellent in Russian Federation but was given a torrid time here.
Although this was a night on which a new generation of global stars were born, Sergio Ramos was not to be left out as the defender lost his marker from a corner to head home his fourth goal of the season on 57 minutes.
Spain's next match takes place in exactly a month, when they visit Cardiff for a friendly match four days before hosting England in the Nations League.
Apple iPhone XS and iPhone XS Max Pricing Leaked
The new Apple Watch models are also expected to come with advanced heart rate tracking and other health related improvements. The 6.5-inch model will reportedly be called the iPhone XS Max , as Apple drops the "Plus" moniker from the devices.