User blog comment:Xilinoc/Ch. 542 - THE BLADE IS ME/@comment-3250274-20130619162621/@comment-3060121-20130620043030

Ichigo would be the third. Ikkaku and Hisagi may have multiple weapons but their zanpakuto only have one spirit inside of them. Ichigo has two Zangetsu spirits. Yamamoto meant spirits not physical weapons.