Board Thread:Boruto Discussions/@comment-3261234-20161118110518/@comment-28500382-20161208180317

Boruto's rasengan dissipates because of an abrupt change in chakra nature into pure wind chakra....If u notice Boruto's ability to learn the rasegan more quickly was partially due to him using both of his hands, by doing so one hand forms raw chakra whilst the other applies the elemental affinity( albeit subconsciously) Rasengans in general cannot be thrown, however we saw where Konohamaru could launch a sealed rasengan using the kote.....To date Boruto is the only true user of the rasengan who is able to throw it, there's no debating whether or not he is a prodigy...he just lacke all motivation and also due to Naruto ignoring him he didnt really believe he was strong enough on his own because of his desperate attempts to be acknowledged by his dad.

His mastery of 3 elemental affinities without training shows he has extraordinary talent alone..........If u notice noone was surprised by his feats with the kote but they were apalled after learning he cheated. If he was just a good for nothing, he would have been snuffed out from the very beginning by if not everybody else his own team mates and sensei