Yes the art did emerge from Daito Ryu, but not from Ueshiba's Aikido. There are no records of Choi in the archives of Daito ryu, either in his Korean name or adopted Japanese name. But Saito is on record in an interview stating his father claimed Choi did indeed attend seminars as an assistant to Takada Sagaku. Choi returned to Korea before Ueshiba had created Aikido. An interview with Choi in the late 80's refers to his art as Yawara, and it is claimed by some that Ji Han Jan added most of the Korean influence and the name of Hapkido, the exact truth will probably never be known. I enjoyed the art when I trained it, it is fascinating, and still use some of the techniques in training today.