Re: top 3 plot no jutsu in the manga
1. You have a point, but Naruto's main goal was to reveal Obito's identity, so that might have resulted in him weakening the Rasengan. However, I agree with you on this for the most part.
2. He didn't Kamui out of the rocks, he got crushed by them. However, Madara managed to save his life by merging him with a Zetsu. Kamui played no part here, since he hadn't awakened it.
3. Sasuke summoned Manda, went into his mouth, and then desummoned him, most likely to Ryūchidō. Later, Suigetsu summoned the two back.
Shortly put, you have a point with the first one. However, when it comes to the other two, plot has nothing to do with anything, you're just misunderstanding the Manga.