When the student is ready, the teacher will appear.
If the student isn't ready, the teacher could be standing right in front of them and they'd never know it.
We all see Ueshiba Sensei's students as they are now. It's easy to forget that they were once beginners too. Can we really blame a bunch of athletic men in their twenties for not really "getting" everything the old man was rambling about? Would we really expect them to have the same understanding that their older selves can demonstrate?
A quote by Antoine de Saint Exupéry
"The essential things in life are seen not with the eyes, but with the heart."
It is my belief that any interaction with O'Sensei was a teaching. A uchi deshi does not learn just on the mat.