You know what they say, the more power or desire to control, the more darker you become. Basically, greed takes the best of you and at times, you just become cold. That's what Itachi meant about Naruto shouldn't work alone. He could have become Tobi 2.0 (ironic).I think Sasuke wants to do something with the ninja system like what Madara is thinking. Plus, more and more, I'm seeing him turning into Madara 2.0.
Yeah, they seem to know what's the plan and if that's what Orochimaru said, maybe they're going somewhere else then show up in the battlefield, or just somewhere else. Don't know about that yet.
Bringing Jiraiya back will be something I'll be happy for.He's one of my favorite characters.But, where does he fit in this battle ? Just bringing him back and that's it... Of course not. There's so many things that needs to be done already in this battle, unless the Sannin 1.0 are going to fight also which I don't see that happening either.
Think about it, the more you work hard alone and the more you desired, the more you start to lose track. Lots of media done this. Like one I just saw, the guy got everyone's acknowledgment but the "bad guy" tells him to push further with his invention, and pretty much warned him if he doesn't continue helping, everyone will hate him, so he continues it. In return, he hurts his love interest feelings. Not very cold way, but later, he was sorry for overdoing his work.
You know, that part was strange. At first, I thought the summon is something that you choose at will. Technically it is, but it's about chakra level. Like for example:You know I just reread 634, and gamakichi told Naruto that Gamabunta was busy with something. So may there is possibility that he might not even be dead, ofcourse I'm just throwing a speculation out there. Maybe that could be the big cliffhanger in the upcoming chapters.
Naruto: Oh! I need a powerful summon now. Let's see. My chakra level is able to use the powerful one.
It's like RPG, hit the right mark to use the powerful form. That said Sasuke is understandable because Manda is gone and/or using him will be bad since he has a bad attitude. Sakura is straightforward and compliment her skills the fact she can summon the highest level. So there you have it. I don't see any reasons why don't have Gamabunta, so it might be a mystery.