About the Minato being stronger than Madara thing.
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"Without some sort of special power, there would be no way to fight him".
Minato doesn't have a special power. He is the Hokage, but he has no Kekkai Genkai (as far as we know), no Bijuu, or anything of that Nature. He is just a genius with some EXTREMELY original techniques and incredible speed. The techniques he invented pretty much sets him up there with people who have Kekkai Genkai and Bijuu's, but it's still not a "special" power because anyone can learn it if they have the ability.
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Take a look at what page that is...It's the last, and Madara is still alive...
Matter of fact, he's still alive to THIS DAY.
He's the reason Minato, Kushina, and all of those people from Konoha that died fighting the Kyuubi (like Iruka's parent's) are dead.
He was able to summon the Kyuubi via summoning technique. Just that alone suggests a huge chakra level. He summoned the thing that gave Pain all that shit, and is able to control it. Regardless of Minato having to leave the battle to go after the Kyuubi, it was Madara's abilities of summoning and control that caused Minato to die sealing it. Thus, Madara won the fight. It would be different if the Kyuubi just came out of nowhere and started poppin shit like Rambo.
Supposing the Fourth didn't have the FTG technique, Minato would have been absorbed. If it was Orochimaru, or Sasori, or Deidara, or Kakashi, or Jiraiya, or any other ninja without space/time ninjutsu that can send them somewhere else, it would have been an instant battle.