However it is human nature to develop and change something to our own way of liking. I would like to think that most wise old men would understand this. If O'Sensei couldn't, and demanded that things be done his way forever then he lacked understanding of this part of human nature.
Teachers would however like to see that the essence of their teachings is present after the students 'made it their own'...
Perhaps Ueshiba did not see that....