Playing for Brazil as a CF is one of the most difficult thing in world football. So it is hardly any surprise that he had a breakdown... similarly the striker is the most abused position in a Guardiola's team. the demands from the striker is far too much compared to any other team. He will grow here being the main man and no one breathing down his neck if he misses a few sitters.. Some players thrive when they know htey can fail.
This is worrying if true. The last thing we need is another mentally weak player.