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 .
That is quite the assumption that you make. You might want to step back from that cliff that you are falling off of.....
Reading the research and having hands on with a number of direct students of O'Sensei (Saito Sensei being one of them), I think that the best conclusion that myself and other people can come to is that his direct students took bits and parts that seemed to resonate with them. NO ONE seemed to get the entire package. They all developed in interesting paths.