There's been quite a lot of information put out about the Chinese connections, even a book, but none put out showing that those connections didn't exist or weren't significant, and none showing that what Morihei Ueshiba developed was technically or philosophically unique.
A number of unsupported assertions have been made, however....
Shinto has been mentioned - of course, that's a Chinese word, which first appeared historically in the Nihongi, which was written in Chinese in the classical Chinese style.
Korea's also been mentioned, but of course we know that the Korean elements originated in Japan.
As to Indian (or further) connections - sure, that's been mentioned in the past as well, nobody's denied it.
That there was a Chinese influence on Morihei Ueshiba and Aikido is undeniable - he himself stated that it existed. The only question is...how much?
Shinto is a religion not a word. The word adopted and used generally is a historical language thing, nothing to do with the religion itself for it is pure Japanese. So some chinese scholar wrote about it....thus making others aware of it......you act like he invented it.
Korean elements originated in Japan? I think the majority of Japanese people themselves originated from korea let alone elements.
Ueshiba I doubt ever stated he was influenced by chinese, that your assertion. He went from Nationalistic to universal. He did often state his major influences though which were spiritual and even blatantly stated they were also the major influences of his Aikido.
So there's no escape if you want to take the influence root.......you have to go spiritual.