- because any member of his main team has stop playing so they create a new team with new people

- because they are helping friends

- in most of the top teams: 4 members leave the team and rejoin so they are grouped vs people of 1500 rating (they only get 2-3 points for winning but is a free win and you dont wait long queues)

btw yes, you get points based in your PR (if the difference with the TR is >150 points) but you can rejoin a team on wednesday and raise your PR to >2000 in 4-5 days easily when you are full S4