It's something that has bothered me for a bit and I kinda just want to have it answered here so it can be referenced: where was it ever said that the Chidori was a result of the failed attempt to make "Lightning Release: Rasengan?"--Cerez365™(talk) 22:12, January 4, 2013 (UTC)
Around the time Naruto was learning nature transformation. Don't recall the exact chapter. Omnibender - Talk - Contributions 22:29, January 4, 2013 (UTC)
Lawx I re-read the entire training period and even checked when Kakashi actually first used the Rasengan, can't find a mention of it any where. The closest I came was Kakashi saying in the Gaiden that his technique was like Minato's moniker.--Cerez365™(talk) 22:58, January 4, 2013 (UTC)
Care to cite a page as well. Because in that chapter Kakashi says nothing that sounds like "i failed to add lightning release to the Rasengan but made Chidori in the process".--Cerez365™(talk) 08:25, January 26, 2013 (UTC)
he doesn't say that because that's not what happened. chidori is an alternative to lightning rasengan and not a byproduct. pg 7, 'if that were the case i wouldn't have needed to develop chidori.' pg 9, 'i wasn't able to combine my elementally recomposed lightning chakra with the spatially recomposed chakra of the rasengan.'—This unsigned comment was made by 18.104.22.168 (talk • contribs) .
Page 7: Kakashi explained spatial re-composition using the Chidori as an example. Page 9/10 he does say that he would have never had needed to create Chidori, however, he does not say that the Chidori is a failed Lightning Release: Rasengan. If you notice he said he wouldn't have had to create the Chidori and if you look at the two techniques, at least for me, there is no similarities in design except for spatial re-composition. It does sound like he might have used the "Lightning Release: Rasengan" as a basis for the Chidori but not "hey the Lightning Release: Rasengan failed but I'll call this Chidori.--Cerez365™(talk) 13:30, January 26, 2013 (UTC)
Apparantly, chidori is not a failed Lightning Release: Rasengan. It was just that he couldn't do it; So he created chidori.
When Kakashi learned how to use the Rasengan, he attempted to infuse it with lightning-chakra as it was originally intended to be combined with element chakra, but ultimately failed. However, he used the same theoretical principle to create the Chidori.