I am not sure about the 1st edition of Dynamic Aikido by Gozo Shioda which was published in 1968 but in the paperback edition of 1977, he mentioned Daito-ryu in the history of aikido.
1969 (second edition) Dynamic Aikido: Mention of "Daito Aikijijitsu" = Check!, Inclusion of Daito history = Check!, Picture of Takeda Sokaku = Check!, Influence upon public perception = NIL!!
Last public demo by Ueshiba including Shioda's usual tricks = Check! Influence of Kodo Horikawa on Ueshiba = Nil, Influence of Takeda Sokaku on Ueshiba (and his students) = Obvious!!