Board Thread:General Discussion/@comment-26379028-20150722090404/@comment-8986886-20150916150245

NejiHema wrote: But then, why did he kill that 3rd seat ? Was that to prove himself?

Chances are that the 3rd seat who Gin killed was one of the Shinigami who had previously attacked Rangiku, so I doubt Gin had much love for the man. Of course, that doesn't justify Gin's actions, it's merely a motive that makes them more understandable. ;)