@Tsukishima: also Naruto is a series obsessed with the growing of the next generation, so we are far more likely to learn about currently growing characters than their senseis, obviously time has passed so we aren't likely (with exceptions like Minato) to see actual full battles from previous generations. I for one would love to see Orochimaru vs Jiraiya, although it was just hinted in that Jiraiya couldn't stop Oro leaving the village, it was never said how that happened. I'm not gonna see that probably but you know what I mean.
@Juju: I'm not entirely convinced Raikage even needs more than one arm, such is his awesomeness. I for one never said Gai wouldn't fight again, I actually wanted him to fight Gai again. Mainly because it's 2 of my fave characters fighting.
Unless Madara had other villages on his his side it would seem like a bit of a cop out. Having said that I am interested in seeing the capabilities of other villages aside from that of the Raikage, Sunakage and the Hokage.