Sasuke will never solo Obito...ever.
Again, another person that has seen my title and decided to jump to conclusions without reading what i've exactly posted. First and foremost, this is a prediction (outcome), not a theory (belief). Secondly, I did not say Sasuke can SOLO* Obito. I've said Sasuke *MAY KILL OBITO* because *OBITO WILL BE 2 EXHAUSTED FROM FIGHTING KAKASHI, GAI, AND POSSIBLY REINFORCEMENTS THAT WILL ARRIVE IN THE BATTLEFIELD.* Im predicting that after the one who knows everything or w.e tells Sasuke the truth, the first person he is going to go to is Obito. & when Sasuke arrives in Obito's location, Obito himself maybe either exhausted from fighting the other shinobi's or 1 of his arm may have leaked away. Amaterasu caught Obito when he let his guard down so what I am trying to say is that since Obito will be exhausted, he may try to pull a ♫We are Family♫ on Sasuke, telling the other shinobi's that Sasuke the troublemaker is here to help him and in that moment Sasuke can hit him with a fast Chidori. This is future prediction not no comparison to overall stats. Just remember that if you meet someone knows everything, they are bound to give you the weakness of anyone you ask for. We are speaking about the story itself and not comparison!
P.S. Dont forget that Tobi has already been hit with Amaterasu. All it takes is him being almost of out chakra or even worse, letting his guard down on a vital spot because of someone like Sasuke who he thinks is a pushover.