The feats of DC and durability of Ashura's avatar and Rikudou PS haven't shown to come close to that of the Juubi's.Opinions on both scenario's. And Ashura's Avatar+PS in the second scenario.
Destructive Capacity - A TBB shot from V2 Juubi had this much output power, [
You must be registered for see links
] an attack that reached the atmosphere. And even a greater AOE when the Juubi is adapting its Chakra, the range of its TBB has even increased dramatically. [
You must be registered for see links
] It was easily crossing from more than 1km island to the battlefield, when Minato teleported. Neither Ashura's avatar and Rikudou had shown it can put on this much raw power.Durability - Do I have to say much on here? Juubi was tanking its V2 TBB with minor damage. [
You must be registered for see links
] The same TBB that can reach the atmosphere. And it was shown to tank its V3 TBB, the same one that can be scaled to be highest DC attack on a map. [
You must be registered for see links
] Although it took major damage, but its own TBB couldn't put it down.Add to the fact Madara's PS, enhanced by the Rikudou's Chakra and Juubi's Chakra (clearly stronger than Sasuke's) being covered all over the Juubi's body, in the fashion that Kurama was covered by, you have triple those feats the Juubi have shown, which were already higher than Naruto's and Sasuke's.
The duo aren't beating that.