Ninja usage is probably skewed due to event usage.

Loads of people use WB and iruka for fox and only fox

pains are useful in ranked and, with tendo, any team PvE event (wanted, TI, jin etc). Even us ftp can get sub-4 min with tendo team in jinchuriki

Similarly, ninjas like mabui and mei often find themselves in ranked battle and that particular cancer might no be as frequently used as you think.

I think usage per category would be a useful thing to have.

Between masuri, jin(also TI, wanted), ranked, PvP and fox, I have a 20 ninja active roster. I'm not even counting SA and arena because that would just be trolling.