Top Legit List Version 8

Well, without any visibility of methodology it remains useless... even the knowledge of whether they're using 2x cards could change that graph dramatically.

Is that based on the top 10 ranks in each class or what?

No, it's based on the day over gain day of all characters of each respective job tree above 100 and above 120 respectively, averaged across all days in a given month in which there was a gain greater than 0.

Since it's a collective average usage of 2x and similar are normalized down to representative samples, making them a legitimate factor already accounted for.