eaterofbabies
How would the reaper death seal get taught once you weave the hand seals your dead unless you have a very rare Uzumaki shinigami mask but even then how did they make them considering they would have to get a piece of the shinigamis Chakra to ward it off affectively also theory Uzumaki might have been able to survive the jutsu considering they had like 3 times the amount of life-force of a normal Shinobu even their civilians lived to like 150-200 years old