Board Thread:Theories and Speculation/@comment-33056229-20170908102621/@comment-5085906-20170908113641

No. The Rasengan was invented by Minato after he witnessed a Tailed Beast ball in action. Amenomihashira was a low-effort filler jutsu that SP introduced because they had a prior model of a Rasengan and couldn't be arsed to make up a new jutsu. They even gave Asura's eyes an MS pattern that's just like Sasuke's even though we know MS' each have unique patterns.