Board Thread:Questions and Answers/@comment-10797017-20130622101437/@comment-8986886-20140606182916

Gacsam wrote: It most likely has to do with their body type and their style of fighting, for example Suì-Fēng is very fast, and Suzumebachi is a weapon for quick and precise strikes.

The Shikai, yes, but Suzumebachi's Bankai is very different from its Shikai and doesn't suit Sui-Feng's fighting style at all.