It should create entirely new tailed-beast-people, as the TT itself is an entirely different 'person'There is a Juubi in isshikis dimension. I wonder if they could just use the SOSP Jutsu to split it into bijuu, maybe make a new Kurama, though it really wouldn’t be the same.
It is just a handThere is a Juubi in Obito dimension, remember when Kakashi used Kamui on the Juubi hand.