Ueshiba was very spiritual. Most all of his students admit that. Understand what he was saying or mostly what he was doing? No, mot so much understanding there.
Therefor it would be good to understand spiritual.
How did they know? How do you know?
They say, they said he was talking nonsense . They say, many wanted him to stop talking. Did these Japanese students ever say he was spiritual or is this an assumption or even a transmission error due to western thinking? Did they think, talking nonsense was equivalent to being spiritual? Was spiritual for them synonymous to talking nonsense? A polite reaction, a polite way to express that they simply didn't understand what this powerful man was talking about?
Spiritual? I don't know what your'e talking about.