From the footage available of O Sensei, ranging from 1935 to 1969, which one would you recommend?
I am not sure this is the right question to ask. O Sensei and the aikikai was very conscious about what videos existed and probably had a hand in the choreography of them. I think the question is what videos illustrate the point you are trying to make. My point was that the author was trying to make a point and he supported that point using a video that probably doesn't show the side of O Sensei being attacked in the article. as an observation, there are plenty of public videos that show a more martial perspective of O Sensei, most coming before the war. Just as easy to find on YouTube, it seems that the author chose to use the video in the article despite the existence and availability of videos which probably better represent the "fighting" perspective the author was criticizing.
For example, Michael Jordan, one of the most famous and best players to play professional basketball, missed more game-ending shots than he made. One could take a collage of those losing shots and create an impression of Michael Jordan that was dissimilar than his greater impact on the sport. Is the collage incorrect? Not technically. Would the impression it left be misleading? Probably.
In his later years, O Sensei (and the Aikikai) disseminated a different perspective of martial arts. To rely on this footage to claim that aikido is not like other martial arts is something of trap because that was the purpose of the propaganda. Some of that is our fault, too. We point to that stuff and claim it has martial value...