Naruto ---> Rasen Shuriken --Can't work
Guy ----> Eight Gates --Can't work
Kakashi ---> Kamui --Can't work
Then what technique can defeat it?
Only Ultimate Jutsu of Rinnengan used by Sage of six paths ;p
Besides, I am sure
Original full power Juubi > Amaterasu, why ?, it has sharingan and rinnengan pattern in eye, so it could probably counter with it's own Amaterasu or absorb it with Preta Path or extinguish Amaterasu as Sasuke did in fight against Killer Bee.
Don't forget that it is source of chakra, so maybe it could even absorb, nuliffy chakra needed for Amaterasu to burn.
Current Juubi last form(form which has yet to reach) - uknown
Current Juubi curret form(second form) - Amaterasu would probably harm it, but not kill. Juubi would regenerate at faster rate than Amaterasu burn, or Juubi use chakra roar on Amaterasu. Besides We don't know if Amaterasu work on Nature chakra from which Juubi is made of.
Please give me link to scan, which shows Amaterasu killing tailed beast or affecting nature chakra.
Current Juubi initial form(first form) - Amateratsu could burn it eventually but only if it would be user of EMS and he would have to focus his eyesight at Juubi, so Amaterasu burn rate has to be faster than Juubi regeneration.
I hope you will understand

, Agree, disagree ?
Explain why you disagree and we can discuss
Have a nice day