kubo didn't exactly set up rules and limitations when he created the shinigami's powers. some are just so broken and over-powered you can't help but scratch your head at how ridiculous they are. so kyouraku or yamaji's powers don't bug me at all. it's kubo for crying out loud!
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"Sometimes you wake up. Sometimes the fall kills you. And sometimes, when you fall, you fly."~ Neil Gaiman (The Sandman)