while i did not expect to see minato in this exact chapter, i had a feeling that he was inside naruto, or at least a part of him, because if you look back at the chapter where the 3rd is fighting oro he describes how the fuuin jutsu shiki fuujin works
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look he says that the user of the jutsu and the one sealed are forced to mingle together for eternity in the belly of death, but instead of the kyuubi being sealed in the belly of death, he was sealed in naruto, so wouldnt part of minato's soul have been sealed within naruto as well??? maybe i was totally off on my conclusions and if this doesnt make sense in the slightest tell me, although dont be too harsh, but if it makes sense let me know