User blog comment:Gourgeist/Shingeki no Kyojin Chapter 65 Review: Dreams and Curses/@comment-3131892-20150122140726/@comment-99.120.99.33-20150122181351

Probably not, but it will soon when Rod learns he may need Eren alive to teach Historia how to control the titans. I think the titan is feminine and may be Annie returning to steal Eren soon.

Kenny knew Rod was lying the whole time about the Titan Shifter's powers belonging only to the Reiss family. This may also confirmed what his grandfather had said about the Shifter's powers being passed into two more bloodlines: The Ackerman family and the Asian Clan. Because of their immunity to the mind manipulation abilities, the Reiss Family foresaw them as potential threats to challenge their rule one day that lead to both Ackerman and Asians Clan's persecution. It could explain Mikasa's abilities, seeing that she is from both the Ackerman line and the last member of the Asian Clan. The only reason why Rod spared the Ackerman family from persecution was because their special abilities were well known to him, as well as Grisha.

My only guess about Grisha, is that he could've came from the town outside the walls like Reiner, Berthold and Annie. He created the serum and may have been sent by one of the leaders to infiltrate the walls and pose as a citizen. Grisha fell in love with Carla and they had Eren. He didn't report to his leaders for a long time, which caused them some concern. Grisha took special interest in Mikasa more than a companion to Eren. His original mission was to kidnap Frieda and take her to his leaders so they can use her powers to control the Titans and overthrow the Reiss family. Unfortunately, she put up a good fight against Grisha and he killed her by eating her alive. I assume he never intended to kill Frieda, but in the moment, it was either he wins the fight or she does using the said abilities that Eren inherited upon eating his father.