Re: The Ueshiba Legacy, by Mark Murray
When Kisshomaru Doshu's influence became more prominent, I don't think we just moved away from his father. The art of Aikido started to fracture into different camps which kept their distance from their neighbors.
Tomiki, Shioda, Tohei, Shioda, Shirata and others - variations in technique became a declaration of alliegence to a lineage. Basic terms used in training, particularly Japanese terms used by English only speakers (IME), became a declaration of lineage.
There are many students who have gone on to be teachers. How much instruction the students received, in whole or in part from Morihei Ueshiba, how many outside influences, how much the students were inspired; that all varies.
I don't think "reconstruction of a dead art" quite applies if the art is still alive if fractured and diluted. The various lineages are worthy of exploration. Over focus on politics can certainly increase the damage and loss, but without an authority the art can just keep getting more diluted.
The training methods - most of the major lineages are students who wanted to find a better way to teach than they were taught.
How perfect was Ueshiba Morihei is a question we might need to explore as well. A Shotokan Karate student can say Funakoshi Gichin wasn't the greatest ever for all time, and Judo students will not say no one will ever come close to Kano Jigoro's skills. Lately people like Homma Sensei have written that some of O Sensei's demos were faked.