Nice bait... "Naruto dies instantly when karuma is pulled away from him"... Lel like everybody else...
That's the point. Uzumaki are noted for having stamina and reserves that are uncommon to normal people and standards, which is why they can survive a Bijuu being extracted for some time. Normal people die instantly. Naruto would have died instantly, had it not been for Sakura, showing he's closer to a normal, standard person than an Uzumaki who still had enough power and stamina to restrain a Bijuu after extraction. You guys sure are getting duller.
Edit: A better way of putting it it this. A full Uzumaki possessed the stamina and strength sufficient enough to restrain the strongest Bijuu after it was extracted. A normal person, in Kushina's shoes, would have died instantly. Naruto didn't die instantly, but immediately lost consciousness and was about to die had Sakura not saved him. Uzumaki=few moments, normal person=zero seconds, Naruto=few seconds. It's clear that Naruto is not anywhere near a full Uzumaki's reserves.
The thread is pretty solid. Good work.