It absolutely isn't.
Training is designed to get players ready for a match, the match is where players put in their maximum effort.
A match will have far more stress on the body than the practice.
Yes because it's constant throughout the season and higher intensity matches than the World Cup.
World Cup goes on for a month.
Mitoma played in the World Cup, came back to play at least once a week between January and March, played twice in Asia for Japan and then has played once or twice a...
Ayari is a bit of an out there shout.
Buonanotte has played in massive games in Argentina, been included in the senior Argentina squad etc.
He's good enough even at 18, his cameos have been impressive and he'll certainly do a job.