During the last few months most of the contests where Div.2-only, and, logically, there must a bigger transition from Div.2 to Div.1, rather than from Div.1 to Div.2. Now we will try to figure out if this is true

Generally, we need to have data about ratings before pleiad of Div.2 contests, after them, and after Div.1 + Div.2 contest. But I became interested in such a comparison too late, that's why I have only the second and third data, which I'm going to compare

On the first 2 plots I've compared ratings of active users before (img. 1) and after (img. 2) contest pair Div.1 + Div.2 took place. You can see a significant leap around 1900 point (margin between Div.1 and Div.2), which is slightly smoothed on the second plot

Making graphics for all users, and not only for active ones, helps us to simply find the old margin between Div.1 and Div.2 (it was 1700). Img.3 is before, and img.4 is after div.1 + div.2 contest

We can suggest, that there is a lot of people, who drops competing after they become Div.1, considering that this is a good achievement, but 2х leap can't be explained only by this factor. Removing users who competed only 1-2 times doesn't change the leap significantly. Does moving of the strong coders from Div.2 to Div.1 makes Div.2 competition weaker and Div.1 one stronger? You judge.