Board Thread:General Discussion/@comment-4957813-20131130185522/@comment-11051098-20140821145422

If the short blade is a kind of spirit weapon, it seems strange that he can fire Getsuga Tenshô with it, and use it together with the large blade to form Getsuga Jûjishô.

But maybe it's possible, since Ichigo accepted Old Man as a part of Zangetsu.