he is sealed in reaper death seal he cant come back from the edo tenesei
Gin brothers were in the stomach of the Kyuubi for two weeks...that's why they have it and they're also descendants of the Sage, Minato's not end of story.Well he did die with half of kuramas chakra in him, and kin gin bros kept the nine tails chakra, so he might have his chakra, but idk