I frequently play Fizz, Shen, and TF jungle and when i do it never gets me S ranks . I know it has something to do with the averge CS of the champion but since these champs are normally laners, i'm always seen as underfarming because of jungle farm.
Maybe the system could check your position and for the CS count look average farm for that role.
It's hard to get S rank as a jungler in the jungle, it requires a high farm, which a lot of champions don't really excel at, or should be doing to properly play jungle
I'm pretty sure I got an S+ both times I did jungle Janna.
The system simply compares you to others in the same role on the same champ. You are not being compared to the lane version if you're jungling, only other performances on the same champ in the same role. So if you're not getting an S, it means other jungle fizz/shen/TF's are simply doing it better (whether that's vias better kdas, or more cs, or better objective control or better vision control or whatever else is hard to say), since it does take into account role.
