minato is a namikaze.. kushina is uzumaki, well the clan was wiped out and maybe survivors was dispersed or scattered, hashiramas wife as i remember is an uzumaki. that said the hidden leaf was able to control the 9 tails. uzumaki traits as i observe is of course the large chakra pool plus endurance. almost all uzumaki i know have a ridiculous endurance.. naruto did not die suddenly.if you remember he was accompanied by gaara and sakura to obito's place.so guessing the locations are farther then that means there is possibility that naruto died maybe minutes after the stabbing.narutos heart beat fainted when they are on ta kamui dimension.so he did not die,its near death rather like sasuke.both of them was in near death state meaning the endurance is an uzumaki trait. obito is not an uzumaki,he is an uchiha. with some modification in his body he was able to control the tailed beasts, and he have zetsu. zetsu is a clone from hashirama cells like yamato. only that zetsu are droids of somewhat.i dont have any idea on how did they do zetsu but as far as i know its somewhat similar to orochimaru experiments.only this one with unique feats.