The worst is Ina, zero doubt in my mind. No skill, no desire, no effort.
I can't imagine Kiara would be much better, but she has the potential if she ever wants to learn. She just doesn't want to.
Ame has the skills necessary to be great, but I don't think she would put in the effort except on your birthday. Maybe.
Gura would be good enough across the board, but the teeth might ruin it.
Once you break down her wall of autism, Mori will suck the life out of you daily. Heh.