Ueshiba was pretty darned irrascible, according to most of the records, so where the "spiritual" focus comes from, without caveat, is sort of dumbfounding.
Ueshiba's reputation was made on his martial prowess, not on his spirituality.
The part about his reputation - agreed.
However Aikido was "created" as a development of his prior martial arts experience, and his spirituality, I think it would be accepted that that was the case.
If you believe the story of O'Senseis "enlightenment" do you think this was "caused" by his prior martial arts, or his spirituality? I suggest more by his spirituality.
Correct me if I'm wrong but wasn't this enlightenment key in his development of Aikido.
Therefore what was more important in the creation of Aikido? His spirituality? Or his prior martial arts experience?