As mentioned in the spoilers, the fact that she doesn't have to keep the transformation technique, already makes her stronger than Tsunade's version...

She's still weaker than Naruto and Sasuke.Thus making my prediction correct.
Ok,but if She uses it up on the Juubi,waiting a noter 3 years to accumulated more chakra is not practical,You can't expected villains to wait 3 years for Her to power up.
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