Well, 4life you got your answer on how the Naruto vs Sasuke battle will be equal. Apparently Sasuke is, or at least can be, as powerful as Madara. WHo would have thought? I say, why is Sakura's power-up an asspull and not this one? I'm sorry, but I haven't seen Sasuke exhibit any power even remotely like Madara's.
Sasuke is all about given. Sakura is all about hard work and patience (ironic). Naruto is all about hard work. Sure, he has the heritage blood in him but that doesn't mean he got the power-up for free. He has to earn it by working it. Sasuke is about what's there to unlock rather than finding it. Orochimaru studied him for almost 3 years, so he knows he can achieve it but of course, since Orochimaru is always ready, he will give Sasuke that powerup.
Think about everything from beginning to know. The only time he trained besides learning the basics back in the past was Chidori. Now, ever since Naruto gotten stronger than him in part 1, he seeks faster power. He gained curse seal 2 before a week pass, he gained MS and EMS, and pretty much let Sharingan do the work. When it's the last time he has to work hard to get that one technique or anything. His battle against Itachi shows his progress from part 1 to part 2 in a off-screen training. Why? Because his character is always like that. Hell, we even got Sakura learning on medic and its rules, why not know how he got Kirin. Besides, if we have to keep up the pace, he has to get it asap. Otherwise, it will drag much longer. Put it this way. For Sasuke, it's shortcut and the eyes. For Sakura, it's hard work and explanation but off-screen. For Naruto, it's hard work, explanation, demonstration, and shown on-screen.
Now don't get the wrong idea. I don't hate Sasuke. I'm only explaining the ways of Naruto and Sasuke (mainly him) on achieving power-ups. It's no wonder why I didn't feel surprised or anything. Heck, you can say this chapter is a shortcut to finally do work rather than, "Ok...I have to focus, balance chakra...." moment. So now, we learn that he will get one more soon. Look at this way, at least we got a heads-up for it.