*sigh*...I answered your question in the very post you quoted.LOL and yet the so called vaizard can use their shinigami power, such as kidou, shikai and bankai, while the arrancar can't use any shinigami power![]()
The act of sealing their power in their zanpaktou is itself a Shinigami power. They are sealing away their abilities in their zanpaktou which is itself what Shinigami do. Tell me, have you seen any other Hollows wielding around zanpaktou? No, you haven't. Only Arrancar who have attained Shinigami powers have zanpaktou because they have gained Shinigami powers.
Vizard are able to use their original Shinigami abilties as well as their Hollow Masks which is a Hollow power. They are part Hollow.