User blog comment:Xilinoc/Ch. 566 (not out yet, but dis gon b gud)/@comment-2211792-20140203180111

I think if you can release your zanpakuto by only saying its name but without the release command, it is still a sign of having bankai. Kyoraku did that, and Tousen, and Renji... I can't remember anyone who does NOT have bankai being able to do that.