Ok, that's the way I was taught but I was watching some clips of Takeno Sensei and it seemed like he was initiating dai ni with shomenuchi. Basically I couldn't tell if it was uke or nage initiating the first movement. That being said, it was an instructional video that was filmed at very slow, film-study, speed.
I haven't seen the film, but if it was Takeno Sensei, he will very likely have uke initiating a ni technique. But honestly, I think it's just a training protocol, so we look like we know what we're doing in a demo. If you are Yoshinkan, too, you know we ALWAYS do things a certain way, except when it's different.