User blog comment:Gourgeist/Shingeki no Kyojin Chapter 65 Review: Dreams and Curses/@comment-189.195.189.152-20150114025317/@comment-99.120.99.33-20150115051538

Rod was lying the whole time about the Titan Shifter's powers the whole time belonging to the Reiss family. There were two more bloodlines that gained those powers from the said shifter: The Ackermans and the Asian Clans. Unfortunately they were both persecuted due to the Reiss Family's belief they posed a serious threat. Even if Historia gains those powers, Rod would eventually realize that it would take her years to master them to the level that Eren did and would need him alive to teach her how to use them.