Even Mr. Pranin stated that Saito Sensei was NOT doing O'Sensei's Aikido, but his techniques were faithful reproductions of what O'Sensei taught. Changes happened because there appeared to be no direct attempt by O'Sensei to systematically pass on all that he knew, even to Saito Sensei. Compound that with the reality that even thought O'Sensei spent a lot of time in Iwama, he was traveling extensively. The lack of continuity of teaching in a systematic manner, over a long period of time led to people studying under him to pick up parts of what they saw, felt and were taught and they ran with it to the best of their abilities. The sharing within and outside of our community is (in my opinion) an essential component in trying to bring our own practice closer to the source. Too many heated debates occur when people try and assume that their own teachers were the one's that "got it" and that questioning them is next to heresy.
Yep. Personally I regard O-Sensei's Aikido as something that essentially died with him and I can't square his behavior with someone who was interested in passing on what he knew. To me it's felt for a long time that he was focused on doing his own thing and just what that thing is people don't really seem to be sure of which leaves us in a Meno's paradox position: we don't know what he was doing so how can we reconstruct it and are we sure we would find any value in it?