Board Thread:Questions and Answers/@comment-2135510-20130608053251/@comment-5693502-20140727205019

All three zanpakuto only have one shikai. One way this can be proven is by the fact that they all possess one true name: Tosen's zanpakuto is called "Suzumushi" Yumichika's zanpakuto is called "" Yushima's zanpakuto is called "Sumitsukigasa".

Agreeing with what Sithryis said, Yumichika and Yushima's zanpakuto have different forms based on how much of the shikai's true power is released. In Tosen's case, what you are seeing are just Suzumushi's shikai techniques; each technique is activated using a different command.