why did naruto die?

[cptenn94]

Kushina was full uzumaki..
Kushina had a higher compatibility
Kushina's chakra was unique which i believe also helped
Seal was weakened so its possible there wasnt as much strain from it being ripped from the body when the seal is at its strongest (this one is only a guess )

Sounds good. Also add Naruto has been fighting for a long while, and has sustained multiple injuries.
Hes been quite some time without sleeping.

 

[Lytes]

The dude is "taking a nap"

 

[~Sky~]

Naruto's not a pure Uzumaki.

 

[Flakez]

Because Kishi wanted to make the situation look desperate.

 

[Red Slayer]

Naruto is namikaze that is why..... (half Uzumaki)