I wouldn't rely 100% on statistics. They of course represent mostly best players of the game, but it's a bit biased too, since the amount of levels solved can also depends on the time we have available to play the game. Someone who work the whole week and has a family at home can't invest big time and will automatically have a smaller amount of levels solved. :)
Top Pathology player is a person who has most levels solved, at the moment.
You can check in Statistics page: there's a button on the main page, for statistics, too.