If Obito doesn't care about his old life anymore, or the world, why does he keep getting flashbacks of it?
He did terrible things with the excuse 'Minato-sensei, I don't care anymore', even still calls him sensei.
Is there any good left in him?
I felt like his flashback was pretty much telling us that all those dreams that he couldn't achieve will now happen with the moon eye plan, and because of he was getting ready to become one, it's like he was saying to himself, "I couldn't become Hokage. I couldn't win Rin's love. But now, in this world, I can achieve them!" I noticed that he flashbacked on the moment that he failed and told that he can do it if he never gives up. Well, he's there, only wrong way. Seeing his sensei was the last time he will see him as a normal Obito, because now, he's Obito the Jinchuuriki.
Between, It's hilarious how Kishimoto didn't give half a damn about the poor Hiruzen in this chapter

While truth, I think Kishi did it to the kages who are relevant to the characters. Hashirama and Tobirama know Madara like that, so they go to him. Minato knows Obito, so he go to him. Hiruzen don't really know anyone there, so yeah.
I thought Sakura was going to be relegated to fodder healing for another several chapters but this chapter changed my mind.
The parallels are going to be brought up and she will most likely appear soon. Kishi is constantly shoving down on our throats how Obito is similar to Naruto with his determination and his feelings for Rin. Those repeated Obito -> Rin panels are there for a reason. Sakura's lack of appearance now is the calm before the storm. And when Kishi shows a parallel, there is always a verbal confirmation.
Tsunade=Sakura by Chiyo, Jiraiya
Kushina=Sakura by Minato
Rin=Sakura by??
Jiraiya=Naruto by Nagato
Minato=Naruto by Kakashi, Jiraiya
Obito=Naruto by Kakashi, Obito
Orochimaru=Sasuke by Jiraiya
Kakashi=Sasuke by Gai
Nice observation. Sorry you have to go through more parallels.
Very true, nice observations! I also think that a parallel between Rin and Sakura will be inevitabile. Maybe Obito will notice how the triangle in T7 is pretty similar to that's between him, Kakashi and Rin once...
Maybe. There are many ways and I do think it only needs to be Rin, because that's the only missing one for Obito. Obito got the Naruto's part down, so now, he needs that Rin of this generation, so it can be connected with Obito/Naruto. Remember, two things Obito failed to gain: Hokage and Rin. Naruto already shows his ambitious to become Hokage. Now, time to show his ambitious to win Sakura's love.
As for Sakura, remember, these last two chapters were about Obito, so now, I do believe we will get Sakura next chapter because next chapter very well be a chapter of reactions from many. I don't know if Kakashi will come back, but we'll see. He will be so hurt that Obito has now become the villain of the world that was once a hero. That said I'm so happy that Naruto vs. Obito is happening. I also like the fact that Naruto's BM vs. Obito will be intense. It will make Sasuke look soooooooooo second rate (that's right, I said it). I mean how his arrow got reflected by those Pain's rods. Sad. But yeah, next volume looks beast.