Board Thread:Questions and Answers/@comment-25199543-20140719134821/@comment-10587310-20140723115352

I believe Ichigo is the only one with a Constant-Release Type. Because when he first activated his Shikai he did call out Zangetsu's name but couldn't control his own vast spiritual power. Thus a Constant-Release Type.

While Kenpachi Does not have a Constant-Release Type. Because when he first activated his Shikai he did call out Nozarashi's name and he could control his vast spiritual power at least to some degree. So no Constant-Release Type.