What do you base this on? In my reading of his life, I am struck by how utterly self-centered he often was. The distinct impression is that he never really "taught" other than by example.
I know what you are talking about. When asked how a technique was done, he'd just throw the person asking the question. However, I recall his son's explanation that taking the ukemi was the only way to learn. He didn't think you could teach form per say structurally, rather Aikido was a living thing that altered according the the individual attack.
I don't think teaching by example is a sign of an ego. There is many that believe it is the best way in which to learn.