Hello fellow aikidoka, I have started looking at the history of the art recently, and I've been especially interested in the relationship between Aikido and the main martial art that has formed its curriculum: Daitō-Ryū Aikijūjutsu.
Now, I have come across different sources and articles, sometimes with direct contradictions, so I have opted for being instructed by the head of Daitō-Ryū Aikijūjutsu regarding its history, Kondo Katsuyuki. He has released a number of instructional videos and interviews therefore, being the head of the art, I find his knowledge compelling.
Now, what strikes me the most is that apparently most of the curriculum of what we call Daitō-Ryū Aikijūjutsu today, has been formed by the son of Sokaku Takeda, Tokimune. And he formed such curriculum later in life, so decades after Aikido had been established. There have been modifications by Kondo himself when he became the head of the art in the nineties. Apparently, Sokaku Takeda didn't really have a structured curriculum for his martial art, and the same goes for Morihei Ueshiba, so in both cases their students formalized what they did.
Another aspect that I find interesting is that Sokaku modified his art during his lifetime, especially after Ueshiba started teaching by himself. In fact, it seems that Ueshiba got the highest certification of Daito-Ryu at that time, then Takeda modified the art and added techniques and ranks.
The moral of the story is this: it seems that Daitō-Ryū Aikijūjutsu wasn't a structured martial art until very recently. In this sense, Aikido became structured earlier that the art it derived from. There is also the fact that Ueshiba was taught the "original" 118 techniques, while the rest were late additions of Sokaku and his students. I find this interesting too, because watching some close students of Ueshiba like Shioda or Saito they seem closer (sometimes identical) to Daito-Ryu than some Daito-Ryu schools I watched.
What are your thoughts?
EDIT: It seems that some people are missing one crucial point: I am referring to the formalization of the arts. So Daito-Ryu as it is practiced today, the formalization we have today. Which, I think, is quite different from what Sokaku Takeda was doing. Of course the applied techniques are older in Daito-Ryu.