Is it because people don't know who Kurotsuchi is?
I didn't know who that was.
Just goes to show how memorable the side characters in Narido are thanks to Kishi's neglecting style. I don't agree with your tier list either.
I'm not sold on Sakura at all. She has strength but her combat skills are shit. I don't see her taking out Neji or Lee. The poison knife thing was a gag, I don't take it seriously. It's like Nami whooping Luffy's ass with her punches when he can survive having a mountain sized skull dropped on top of him.