You did not understand my question well. Kurama, Kushina and Minato were sealed into Naruto with the eight trigrams seal. When this seal was made, Kushina was alive(
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before the seal, Kushina was still talking) Kurama's half power was in the real world and Minato's soul was almost taken by the death god. My question is why kurama's chakra can regenarate itself while Kushina's can't or maybe kurama's chakra is fixed,too. Minato is a different matter, I think he said he sealed his chakra with ETS, but ETS seals soul just like kurama's soul and possible explanations are that the death god can't eat Minatos soul sealed by ets and can eat only other part of Minato's soul and this leads to that question if the death god is avoidable.