Highscore is ranked according to the amount of total level you have. It doesn't concern the amount of xp u have in each skill or total.
If you were to separate these 2 modes, its like separating a server into half. Theres pros and cons in these modes. Even if they're disadvantage in their training, they still have a upper hand in terms of other aspects. Players will still compare and contrast with each other regardless of their modes.