When he beat Kurama, he got a new seal. Read chapter 499, A New Seal.
What new seal? Minato's seal can't just magically vanish and be replaced by a new one. Naruto knows no sealing jutsu. Kushina used no sealing jutsu nor did Yamato or Bee (they both were there) so whats this new seal he has? Who used the new sealing jutsu? Its still the Eight Trigrams Seal, same key Minato created and gave to Geotora, thus he can literally extract Kyuubi from him. Your right, Naruto has the key now so he could unleash it again if Minato tries to seal it so extracting would be the way to go. This is KCM Naruto, he and Kurama are not on good terms so when Minato extracts it he would break free and Naruto would die.
Except, he can't use a seal on Naruto when Naruto already has a seal on Kurama. Not unless he takes that seal off first, which he can't do without the key.
I kinda addressed this in the first part. Minato created the key and the seal. Its nothing for him to extract it, its as simple as when he extracted Yin Kurama from himself no difficulty in seconds, and he and Naruto have the exact same seal.
S/T Barrier won't work when Naruto can use FRS as a guided melee attack instead of firing at them, and it doesn't matter if Minato can teleeport since he can just use Ay's strategy. When Minato teleports, use Shunshin to go right to the marking he just teleported to, giving him little time to react. The fact that Naruto can match the amount of markings he has with clones doesn't help your case any better, and the fact that from a close distance, he barely evaded Ay.
Okay he can do that but it won't change anything. Third Raikage dodged that twice no difficulty with basic side stepping. Considering Minato can do that on top of teleporting out of the way completely, its safe to say that guided Rasenshuriken won't hit him. Ay's strategy won't work because Naruto's attack/fight speed is still not that great in KCM. He never landed a hit on Obito at all and we know Minato teleports faster than he uses Kamui so I don't see him hitting Minato. Even if he trys to shunshin to Minato when he teleports, he still needs to attack Minato, and his fight speed is not something Minato can't evade once more with Hirashin.
Naruto displayed that speed versus Ay one time and it was never seen again. This was because it was not just his Shunshin, it was his foot-speed + shushin. Naruto was already running at top speed when Ay came at him then just shunshin'd on top of that to dodge him. If he was standing in one place like Minato was and not moving, he wouldn't evade that attack. Minato on the other hand was in one place and still reacted to toss his kunai up for his counter attack so I wouldn't call that barely dodging because he could have just teleported or shunshin when Ay first took off without taking the time to toss his weapon.
He also does not need to just teleport to his kunai he has. He can mark the ground, a tree, or any physical area. He can teleport to his kunai in the air as he did with Ay, he can teleport to his clones, or have his clones teleport him. Naruto is reckless and uses enormous amounts of chakra that end up being wasted most of the time. Minato can track his chakra levels and I think you know the risk of KCM.
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If he stays in that mode too long he will eventually dry up and using shadow clones just doubles, triples, or how ever many clones he creates the rate of this happening. Kurama had purposely stopped taking Naruto's chakra though (a.k.a. Plot no jutsu) so he didn't die, according to Gyuki. This is not the case in this fight though and Naruto would burn out using high chakra taxing moves while Minato is using the tiniest amounts of chakra to dodge them. I'm sure he wont run out of chakra either considering his levels are extreme, hes a sage and even teleports things like Kurama and max Juubi Dama in base.
I think Minato will win if it comes to a battle of attrition or he just swaps Naruto to him and extracts Kurama from him.
