Board Thread:Questions and Answers/@comment-10797017-20130627100621/@comment-4161952-20130715003623

Yamamoto did fit the description of a special war power. Yhwach knew that he had become weak after 1000 years, so he didn't label him as one. He knew the old Gotei 13 was a group of merciless bloodthirsty killers. He was afraid of them. I'm sure a few of them could've been special war powers, including Yamamoto.