Board Thread:Naruto Discussions/@comment-3279282-20140521095322/@comment-24908068-20140521154750

Most likely Madara only took a portion of Gyuki charka, as it seems killer has a unique substitution jutsu and is able to extract himself from the tentacles of Gyuki. However we already witness this technique when Killer b fought Sasuke, so no one should be surprised. Also when the Gyuki was to be extracted it was depicted that one of Gyuki tentacles was cut off, foreshadowing Killer B using a substitution technique.