Perfect Example of Underdog: Naruto vs Neji, everyone thought he was going to lose, he proved them all wrong. I literally posted the definition of underdog, its not my fault you morons can't comprehend its meaning. You uchiha faptards are known to defy mangafacts, but to defy a word and its definition is beyond delusional. Stay Rustled
He proved them wrong with a beast that was sealed in him since birth. Again, that is not his power. That is the power he received from the fox, so the notion of underdog is completely cancelled since he spoke to Kurama.
If in fact he did not ask the fox for his chakra, then you can talk. Since he did, you can shut up and save yourself the little shame that you have left.
He's not an underdog if he isn't using his own strength to beat the odds staked against him, nor is he an underdog if he has to ask outside sources to lend him strength.
You seriously need to give it a rest. It's annoying.