Casimero coming to Manchester United is a big positive note to the club. If Maguire is out of Manchester United then it's even better. Maguire has been a poor captain for Manchester United for quite a time without anyone to take up the mandate. Maybe De Gea or Ronaldo could take up Manchester United's captain role. I know Ronaldo has a very rocky relationship with his teammate but you can't deny him. He was a great leader since he led Portugal to win the Euro 2020 cup.
When the team is in harmony, they play well. If Ronaldo has a friend who helps him he will play better.
All the champions need to have friends or support, see Messi who had many friends in Barcelona, now he doesn't pay much.
See the internal quarrels at PSG, in fact the team should be the strongest in the world, yet it does not take off...