I think that you might agree -- in the end it is all kokyu, and it isn't O-Sensei's Aikido without it -- that being the (unspoken) point of my initial post.
Man, no offense intended, but if I have to do all this stuff to have "O Sensei's" aikido I'd just assume not have it.
I've never spent any amount of time on breathing other than basic stuff like "breath out when you throw" and how to breathe while taking uke. I'd just assume be training rather than doing all this.
My Aikido seems none the worse for it.