This was my opinion of Roy expressed to some rather frustrated students of Daito Ryu wondering why they never "got it.":
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It's my understanding that quite a bit isn't shown to ni-dans and san-dans and such.
There is quite a bit that comes later...if at all. I know you all practiced for years. Everyone practices, but not every one is chosen. I don't know why you weren't shown, but stating what Aiki is or isn't, by your personal experience as defining the entire art, is simply not a good plan.
We have spent years reading on many forums and in countless interviews done with Stan Pranin where Japanese Daito Ryu shihan openly stated that they did not teach the majority of their own students. Instead, they picked one or two "so that the secrets wouldn't flow out of the school." (more on that later).
For that reason any of you making statements that "I don't think this or that is in the art, because I wasn’t shown it and haven't seen it." Is rather ridiculous at face value and can have serious logic flaws.
For starters it can be seen and can be mimicked without actually getting it.
Teaching?
Remember Takeda and Tokimune saying repeatedly that "they showed different things to different people in different places?"
What do you think you get when you ask those people what they think the art....is?
Remember Tokimune and Sagawa admitting that they never taught their ENTIRE school the true art?
Weird huh? Imagine being an insider, being the secretary or president of Tokimune's organization and finding out thirty years later he was actually only teaching Kondo... Who many considered AN OUTSIDER??? That wasn't even a regular member of the dojo. That really happened.
I think you need to consider who else might have done that.