I forgot who said it i think it's Drogba , he said Jose Mourinho is always harsher to a player he knows can do better / didn't reach or didn't try to reach their full potential yet. For example, he won't be harsh towards ben davies or winks because Jose knew they have done the best they could do , their ceilling are not high. Read to the story of how he made ozil cried inside Madrid dressing room and then ozil went to have the most assist in europe for that season. It's about whether the player take it to their chin and responded to him positively or stay as crybaby and be a loser for the rest of their career.