Sakakibara Sasuke earned his position as weilder of the Beninuki, by decapitating all the other candidates.
Sasuke has a strong love for blood and mutilating his opponents. He is describes the joy of being able to stick the beninuki into the chest, twist it and pull it out, guts and all.
During the start of his fight with Zenmaru, he shows a useful use of the Beninuki. To thrust forward with the sickle part of the spear running parallel with the sword. Then, once the spear has passed his head, Sasuke twists the spear and brings it back with the hope of decapitating his opponent in the process.
Zenmaru shows strong speed and strength and manages to cut Sasuke's ear off, Sasuke shows no pain to this and seems to go into an even more blood lust craze.
He shows the true power of the Beninuke, "Chigarami". Where he rotates his spear quickly and the design of the spear, the sickle being asymmetrical to the point, causes the shaft to bend making it difficult to dodge. This though is overcome by Zenmaru deflecting the spear with fast swings.
Sasuke resorts to throwing his spear, but misses and being defenceless is promptly cut in two.
The Beninuki (Crimson Extractor) is a long spear with a short sickle pointing out asymmetrically to the point. The spear can mutilate people in many different ways, and this is what gives it its name.
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