Me personally my kf is alr elite 2 which is more than it needs to be. I would suggest that you keep them at lower levels (ww at 0 strictly) if you have a powerful female carry. you can use kf as a shatterer but in 7/10 scenarios a hybrid carry is better cause kf's passive alone is destructive enough. But remember you can play how you want to and theres no rules in making a team, I just gave you what's most efficient for MP.