One thing I find strange is, it doesn't appear that you need a human sacrifice to seal a Bijuu inside a body, unless i;m mistaken Mito sealed the Kyuubi inside herself, and did not require a human sacrifice, doesn't sound like the sealing of the Kyuubi inside Kushina required a human sacrifice either, so why did the fourth have to pay with his like to seal the Kyuubi away? Or is there something i'm missing?
Maybe the answer is that there wasn't any need for human sacrifice because the Kyuubi is already restrained, in Mitos case there is Shodaime with his wood techniques and in Kushinas case the Kyuubi is already sealed inside Mito. Also the situations differ very much, when the kyuubi is sealed in Naruto it was in middle of a battle, so Minato needed something which is fast and has great realibility!
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Now I was to know why Naruto has those markings, if it's because of the Kyuubi why doesn't Tsunade have the marks?
Maybe because Tsunade is the
grandaughter of Senju Hashirama and Uzumaki Mito.