Re: Senjutsu Amaterasu = 1shot on Juubito?
Its about time Sasuke got a legitimate upgrade. This at least puts him on a closer level to Naruto.
O/T: I think a lot of people are overestimating Sasuke's new Curse Mark Susanoo. First of all, a Natural energy Susanoo is pretty impressive, and it alone may be enough to at least push Obito closer to his limits. However, this is still Obito and the most powerful entity known to exist in the Naruto Universe. I really don't think Sasuke has what it takes to one-shot Naruto, let alone Obito, at this point.
Secondly, there seems to be a lot of focus on Amaterasu. Amaterasu is still a ninjutsu. Unless Sasuke can alter the basic properties of Amaterasu, it still wouldn't work on Obito. In response to this, people mistakenly point out that Naruto used a Rasenshuriken on Obito. This is wrong. Naruto used a basic Rasengan infused with Nature chakra. Amaterasu, on the other hand, may not be able to be altered in this way.
I'm not ruling anything out, but I really doubt that the answer to the Obito situation is Sasuke just needed Sage Jutsu. Sasuke (with Susanoo and Amaterasu) will be instrumental in defeating Obito, but not without Naruto's help.