Board Thread:Naruto Gaiden/@comment-32622248-20170719100834/@comment-734582-20170729075444

Bambusek wrote: Well, it looked like no one (beside Bijuus), not even Uchiha "know-it-all" Madara, knew. Well, as far as people knew, removing the Biju killed the jinchuriki. As far as the Konoha experts knew, the Uzumaki could extend that time. But actually testing if a reseal could save them would put them at massive risk. Mito never lost Kurama, and Kushina was the second Kurama jinchuriki, leaving no time to try. And as far as we know, no other village possessed people like the Uzumaki, meaning that few were probably aware that one could survive the extraction at all.