</div><table border='0' align='center' width='95%' cellpadding='3' cellspacing='1'><tr><td>QUOTE </td></tr><tr><td id='QUOTE'>Insomniac: While the Kyubi may be the most powerful being in Naruto, I don&#39;t think that he is undefeatable. There is Gaara&#39;s demon, Gamma Bunta, and lot&#39;s of strong Ninja&#39;s in the Leaf village for the Kyubi to contend with. </td></tr></table><div class='postcolor'>

It took on the whole of Kohona. killed alot of them too and it didnt look like it was going to stop anytime soon, it took the 4th sealing it (not fighting it) to win.
Basically this tells us that you cannot beat the Kyuubi in a fight

Gamabunta is no where near as strong as the Kyuubi as just its tails were enough to destroy trees, and hes got 9 tails

the reason why theres such a big deal about the Kyuubi is if it ever returns there will be no one to stop it, now that the 3rd and 4th are gone. It would destroy each village systematically