Gaurin Sensei does not support the idea that Doshu watered down Aikido or took Daito Ru out. He says that O Sensei did this.
I have no issue with the idea that Morihei took an active part in the blurring of the historic record - I don't think that I recall anyone here doing so either.
He does, however, quite clearly implicate Kisshomaru as well:
Later, when O Sensei died, an issue concerning the stabilisation and transmission of Aikido as an autonomous art came up. One way to ensure this was to cut the historical ties with Daito-ryu Aiki-jujutsu.
Nagare, "the dynamic utilisation of the aggressor's intentions" is the typical form of Aikido that developed after the death of the founder; this is the particularity of what we call modern Aikido.
He does not claim that Doshu was lacking in his abilities as many have stated in previous discussions. He praises Doshu for his ability.
Personally, I always thought that people often underestimated Kisshomaru's abilities - probably in contrast to his father. I felt him quite a few times, and he felt plenty good to me at the time.
And BTW, it's still
not "Taku Muso Aiki".