Who worked under Benitez for 3 years. You know, someone who knows him
Benitez has often been considered a bit cold by his players. This is not big news. He is extremely professional, which in some situations can be negative when working with people. That said, most players who have played for him will say that he was extremely detail-oriented and had an enormous amount of knowledge. Just google it.
Many players do not like this either. They want to play under far more freedom, and do not care much about in-depth tactics. Therefore, they dislike this type of managers. Guerdiola is a bit of the same type of manager, and he too has had players who have disliked him enormously. Ribery, for example, was not very happy with Guerdiola - which was about a conflict between system and individual. I think a lot of the same applies to the relationship between RB and JR. Therefore, he has also fitted in well with Ancelotti, who has about the same approach as Harry Redknapp. Be friends with the big guys, and just let them play.
And for those who think Guerdiola will not try to shape
Grealish in MC, and give him quite clear instructions on what to do, do not know the philosophy of Guerdiola. Had JR had Guerdiola as manager, it would not have been a good match.