They would not die because they have the Juubi wthin them which serves as their life support. Anyone would get wrecked 8 Gates Juubi Jin even Kaguya would get stomped.
If Lee or Gai become Juubi's jinchuuriki, it's already an asspull. So after that, it doesn't matter they survive or die, since both logic and asspulls become relevant at that point.
They would not die because they have the Juubi wthin them which serves as their life support. Anyone would get wrecked 8 Gates Juubi Jin even Kaguya would get stomped.