If you look at O sensei stance, it has nothing to do with yoshinkan stance
......ooppppsss...
In the beginning of technique he did very "sword" stance with his weight on back foot. So he could literally jump forward doing deep irimi. As we can see it in "Budo" movie.
So I'll say: when in doubt, follow Holly Sword Way. Aikido isn't grappling anymore LOL.