User blog comment:Xilinoc/Ch. 650 - THE THEATRE SUICIDE SCENE 4/@comment-24574959-20151105100214/@comment-2220112-20151109162035

The shinigami can use other shinigami weapons, just like Quincy. Kenpachi took his sword from someone he defeated, that's part of the reason it took him so long to communicate with it. Tosen used the sword of his friend that was killed this whole time as well.