[Whewt22]

I stil don't understand what your asking. But Aizen expirimented on Shinigami/hollow hybrids, which were good. But he wanted hollow/shinigami, and he unsuccesfully made anything worthy for his plans.

So basically he used the Vizard as a ploy for Kisuke to reveal hes made something to save them, or to create something. Luckily enough, hes already made the hogyoku. But unfortunetly Aizen got his hands on it, and he can now succesfull create and had created the hybrid he wanted.