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Are people using Naruto sealing and unsealing his seal as proof he has some sealing ability? This is not true, considering Naruto signed the contract AND he saw his dad fix the seal for him. If anything, it'd be a shock if Naruto didn't know how to do it, given that most jinchuuriki sealed like that and having the seal contract should be able to unseal and seal their own seal. Naruto has not done anything special or new here, he only did the opposite of his dad in order to fight the Kyuubi, and then do what his dad did to seal the Kyuubi back in.
Some believe that giving chakra to another is some sort of sealing technique.
If that's true, then Tsunade and Chiyo are the masters of sealing with Minato being the god, given he was able to put his and Kushina's chakra inside Naruto that lasted for a decade and half, while Chiyo was able to give Gaara her chakra to bring him back to life. Given that Kyuubi was able to give chakra as well, Naruto's ability to give chakra is nothing special.