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Don't need more proof than this. Nothing he is doing is working. He can't escape that other dimensions. Obito knows how to get in though. Minato and Tobirama can go there as long as they have a seal there. Sasuke is stuck and is busting mad sweats from the heat and is exhausted.
I thought people said he will discover his new Rinnegan powers and break out with his S/T technique? I thought his S/T was superior to FTG, and Kamui? Well, looks like Kishi disagrees.