Analysis: Role "mains"

Yesterday, I posted a theory about mains and flexers:

Today I took view at the data from a different angle and can prove this interpretation now. This is from tier 7+ players with at least 20 ranked matches again.

players tier and average ranked trueskill by mains/flexers

The first 3 rows are “hardcore mains”, which are players who pick one role over 100% - 41% = 59% of the time. They pick their favorite role so often that they cannot main a second role (because “main” starts at 41%).

The next 6 rows are “two role flex mains”. A player picks two roles between 41% and 59% of the time. They alternate between two roles but never play the third.

Most players fall into the “hardcore main” category because the interval 59% - 100% is significantly larger than 41% - 59%.

As you can see, damage mains are the vast majority of two role flex mains, being twice as many as captain + X flex mains in numbers. The second most popular combination are “walking through the jungle” mains. Very few players are captain + carry mains.

Carries in general take the lead in the skill tier ranking. Carry as primary role + X is similarily successful.
Players with captain as their primary role are the lowest in the ranking.
The most successful players do not main two roles at the same time and stick to one.