Re: Tomiki and the Theory of Aikido
I was drinking beer after training with a Shihan of Osaka Aikikai (after being invited to train at his dojo) and he told me he used the book for his High School students. I found that interesting on two fronts a) that he used a Shodokan book and b) that he used a text book. I assumed he was teaching a class room component since as you mention text books in the dojo context would be an anomaly.
I know of a could other Aikikai Shihans that recommend the book to their students - but again calling it a text book might not be accurate for the reasons you stated.