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?