Board Thread:Theories and Speculation/@comment-29033274-20160713180744/@comment-1018594-20160714004550

In addition to what everyone else has said, I want to add that the Rasengan was explicitly stated to be based off of the Tailed Beast Ball, which automatically makes it structurally and functionally different from whatever Wind Release technique Asura was using in this episode. It looks like a Rasengan, but it's not.