SR doesn’t represent a person’s skill or game sense sorry. I know people want to believe it does but it doesn’t. Overwatch matchmaking intentionally pairs 3 bad players with 3 good players for 50/50 win chance. It uses skilled players as carries so bad players don’t lose every game cause blizz doesn’t want their feelings to get hurt.
Edit: Also your statement isn’t even true a lot of the time. Most games mix ranks together and the SR gaps can go up to 1500 on the same team.