I never said he knew everything but he knew an aweful lot more than Jiraiya or anyone else because the slug compiled all the info for him.
Lets put this in list form:
Naruto knew:
1) 6 bodies
2) The real one wasn't with them
3) Preta path absorbs ninjutsu (which is close enough to absorbing straight chakra so if you're smart enough you can make the connection)
4) Deva path repelled or attracted everything
5) Deva path has a 5 second interval between uses of his powers
6) Deva path needs longer to recover after using larger version of his powers
Naruto didn't know:
1) Chibaku Tensei
2) King of Hell
3) Chakra controlling rods
Pain knew:
1) Naruto gets angry easily and is "unreasonable"
2) Naruto uses brute force and close range fighting (maybe)
3) Naruto trained under Jiraiya
Pain didn't know:
1) Sage Mode (very major thing, giant speed, strength, and chakra boost)
2) effects of natural energy
3) frog katas
4) FRS
5) extent of Kyuubi's destructive potential
6) Naruto's resolve
Naruto had a clear advantage the whole fight. If he didn't know about Preta's absorption he would have wasted an FRS right there to find out and would've started out much lower on energy. If they knew nothing of each other Pain would've wtfpwned Naruto.
Pain was weakened after his assault on the village. He used a crap load of power making that crater and Deva Path's abilities were gone for like the first half of the fight. Deva would've protected the 3 other bodies that died before he got his powers back with his Shinra Tensei. If they were both fresh Pain would've wtfpwned Naruto as Naruto would not have landed a single FRS due to Deva's rejection powers.
Pain wasn't trying to kill Naruto because he had to capture him so if this was an all out fight to the death (the only true way to measure two ninja against each other) Pain would've stabbed Naruto through the face when he Bansho Tennined his ass and had a black chakra blade sticking out waiting for him. With that move Pain can pretty much one hit ko anyone without an ultimate defense sort of thing. If Pain was trying to kill Naruto from the start he would've wtfpwned him.
Anything else you wanna argue? Or do you finally agree with the other posts I made?
Okay, so Naruto was trying to kill Pain? Oh I forget, Naruto always kills his opponents. Naruto ALWAYS kills, I mean look at the "Itachi" guy he used Oodama Rasengan on under the Kyuubi influence. He even said "I won't kill you", to the main Pain. Naruto had to keep track of 6 separate bodies. On top of that, Ninjutsu is made from chakra, and it is external. Chakra is kept internally. Oh yes, I forgot, Pain got behind JIRAIYA and absorbed his chakra, and then JIRAIYA wrote that on Fukasakus back... So theres another advantage.
1. Pain already fought against Sage Mode Jiraiya, took him out even though Jiraiya had Shima and Fukasaku on his shoulders. Naruto didn't, thought of some spur of the moment plan. I am sure that fighting someone in Sage Mode would alert you to what it can do. Pain faced it with Jiraiya, then faced it with Naruto.
2. The extent of Kyuubis destructional potential? Sakura probably knew that before she saw Narutos Kyuubi transformation. Everyone whose a ninja in the Naruto Universe already knows that the Kyuubi is the strongest of the beasts.
3. Narutos resolve isn't a fighting technique. That only came in handy after the fighting had stopped.
4. Naruto had been training right before he fought Pain. Pain was kickin it with the baddies right before he went to Konoha.
There is one more thing I'd like to argue...
PC or Mac?