There is somewhat confusion on how ranking work.
I couldn’t find a official Blizzard topic about this, what I did find is some good explanations of people (some a bit outdated but i think it’s still the same ???)
Blizzard : could you plx make an official post on how MMR, SR and ranked works.
(shouldn’t be hard for you guys and I do think it would promote better team work in general if people understand that going solo is usually not the way to go)
Here are the link: