^^^This!!! You called the following things plot powerups:
1. Izanami
2. Konoha 11's new jutsus
3. Bijuu Mode
4. BSM
5. Minato having KCM and BM
6. Kakashi mastering Kamui
7. Rinbo Hengoku
8. Sasuke's perfect susanoo
9. Madara's whole arsenal.
10. Sakura's byakugou seal and summoning jutsu
11. Kyuubi Chakara Cloaks.
12. Madara's revival.
I might be missing some. This is all I can think of right now.
You guys do know that not every little thing has to be foreshadowed or be given a lot of development. We don't need to see 5 chapters about how Kiba learned shadow clone jutsu. As for stuff like the Kyuubi Cloaks, that was actually apart of Shikaku's final plan. Therefore this was in fact planned and it wasn't pulled out of nowhere. As for stuff like Rinbo hengoku and izanami, there was never a law stating that the sharingan or rinnegan couldn't have more than what has already been displayed. Seriously! I feel like some of you people just looked at Nagato and then just assumed that that was all the rinnegan could do. It has even been stated that the rinnegan could bring fourth any ninjutsu! The same concept goes for sharingan (not the any ninjutsu part). When you people saw izanami, you seemingly said to yourself "I've never seen this jutsu before. Therefore it is illogical. Anything that I have never seen before or that I could not predict is illogical". Once again I must say that something is not illogical just because you don't expect it.
That is all I have to say.
Ps. People say that I write walls of text, but I do not. All of my threads and posts are nice and short and to the point.