Hiei, speed blitz
I don't want to Count Kakashi out at all, but I'm worried. I am leaning towards Hiei heavily, but Kakashi can Kumai Hiei, but like they said speedblizt. The only problem I kinda see though is that Kakashi MAY be able to subsitute, or go underground. As Kakshi likes to employ clones, and diversionary tactics, but still Hiei might be too much for him.
There is seemingly no 'perfect' way to truly say goodbye. So I gathered a bunch of them!