Ellis's HIPS book, first chapter "The Chinese Connection". very interesting reading. i am not going to put stuffs here. ya gonna have to buy the book and read it for yourself.
Since that is one of Ellis's books on martial arts, I have read it cover-to-cover twice and have gone back to it for specific passages innumerable times. I do not believe there has been any solid evidence unearthed that indicates that Ueshiba or Takeda had any direct influence from Chinese martial arts.