Saotome's resume (http://en.wikipedia.org/wiki/Mitsugi_Saotome
) sounds like a standard, postwar, Kishomaru/Tohei, student experience.
According to this quote from Nishio, Ymaguchi was doing his own thing.
Perhaps this is why, you don't find the Founder's Aikido in yours .
I said that I trained with him in the '80's - that was almost 25 years ago and since then I've trained with a number of other groups, including with Iwama groups and with Morihiro Saito in Iwama.
I just preferred the Yamaguchi teachers that I've trained with - that's a personal preference, as much to do with personality as anything else, it's not a statement about different styles.
I've also trained with Yoshinkan groups, and spent a few years in Daito-ryu, and others. I've seen the elephant.
So...what's your elephant? And does it make an iota of difference to the discussion?