no need to assume.

it's confirmed and all correct, except for 1 thing

If Kushina got erased out of the battlefield (from skills which prevents revival like Madara GNW chase, Masked Man mystery, Tendo chase +2, etc...), not only does the passive won't be active anymore, but the scales that the units has gotten through her passive is gone as well.

For example, Edo Minato mys 2 times from r1 to round 3, gaining 82% Attack, 24% Critical and 24% Combo scale (64% Attack from Kushina and 18% Attack from his own chase), but at round 3 Kushina got erased by Masked Man's mystery

after Kushina got erased, Minato lose the 64% Attack and 24% critical scale.