i disagree about gaara,,,and its prob the same case with the others,,
gaara's sand doesnt come from the juubi, he never controlled it. and gaaras juubi uses wind element, it was just mixed with gaaras sand,
i believe his sand comes from his mothers jutsu, since the juubi is extracted from gaara and he maintains the sand technique.
as for the others,
bee doent have ink himself, its the eight tails ink, bee is controlling eight tails. but extract the 8tails from bee and no more ink.
naruto he cant heal at any moments at the times he havent mastered the nine tails,before, naruto heals after his rampage like what happened with pain, but sometimes rampaging damages naruto and naruto regenerates by his own, prob. not the nine-tails..since nine-tails want to break free from naruto before, why would kurama heal naruto?
the same goes for all juubi i think.
well its just my Point of view =)