Quote from xdude101
When Naruto first tried to join the war, he was confronted by the Raikage and the Hokage and he used a "speed" technique (or instantaneous motion technique) that created a yellow flash. It was also discovered earlier than that that Rasengan was an attempt to duplicate the tailed beast bom ...
Thats speculation remember the 4th hokage created the Rasengan for Naruto not his wife. His reasoning was that Naruto would eventually have to deal with Tobi AKA Obito. He also based it off of the Tailed beast bomb. His wife would not have been taught these because back then they were simply considered hostages back in there village she would have been a house wife so to speak.
The only thing i think that might not be speculation is the thing u said about Obito using those chains.