I start to think the Sage wasn't that strong

[Rainbow Dash]

The incomplete form of the Juubi was casually throwing out continent busting attacks. The hype for the final form says that he the Juubi even has a planetary range. I don't think Rikudo defeated it, but did the ol' fuinjutsu troll.

 

[shelke]

It lacks two most powerful tailed beasts. Did you skip your breakfast today, Boggy? I thought it was obvious.