i disagree if you guys look at the the pain v.s naruto fight you can clearly tell little naruto could of won all by himself,the plot itself advatanged to nagato,because he was trying to capture him without using too much chakara,thats why he started talking about jiraya,he wanted for naruto to give up on his own and let himself get captured,Why you ask?because at this point most of the akatski members were dead-so it would take double to tripple the time to extract kurama out of naruto.technically it was naruto by himself v.s 6 opponents,the frogs were fighting the summons,the two toad sages only helped him out with some knowledge of pains powers.and when they were gunna officially help out naruto,the green frog gets killed,so he just falls to the floor when he tried to save him(naruto could of easily stood up-but thanks to plot no jutsu) he felt distraught because he witness somebody close to him die,and most of the villagers were also dead,so of course all the feelings he had before the fight triggered when he saw the old geezer frog die.i would consider it an even fight because 1,nagato is almost double his age so he has double the battle experience,nagato has rinnegan and 6 human bodies,and naruto has sage mode and the kyubis chakra,and dont forget the rinnegan allows them to use any elemental attack-it just wasnt narutos fault that bitch ass nagato forgot that he has fire techniques againtshis rasengan,and water,and thunder,and earth and etc.