If you take it from this point of view, yes, Peter is right! Osensei did not invent Aikido, Kano did not invent Judo, Funakoshi did not invent Karate. If you want to push this concept further, Jesus Christ did not invent Christianity because all the concepts existed befor in other eastern religions. Buddha did not invent Buddhism since in china Taoists had already discovered his principles many hunderd years before.... etc.
Isn't it much simpler to say, Ueshiba is the father of modern aikido as we know it today?