Re: Sasuke's Intelligence = Minato
Black Chidori was only used with Curse Mark and it was just something to look cool like Vermillion Rasengan. Sasuke doesn't know Black Lightning release. If he did he would implement it in his other lightning based jutsu, to improve their power. If he could do it with chidori as he wanted, we would have seen it again along with black lightning chidori true spear and/or chidori stream. The creation of jutsu is effected by intelligence, but it's more like the creative portion of their intelligence.
Minato predicted Naruto would grow to defeat Obito, which is inevitable. Minato was able to defeat Obito, and I'm not trying to use A>B>C but Sasuke not only can't defeat Obito, he had to be saved by Obito in multiple situations. Sasuke fights with rage, and rage leads his battle strategies to predictable directions. He rushed in the Kage Summit and almost died several times, saved by Gaara, saved by Obito. Sasuke isn't bad, but he isn't that good at keeping a level head. Cool heads prevail.
Minato has a cool head. Minato protected the village, sealed Kurama, and left a legacy for Naruto to follow. Even his Rasengan technique was perfectly engineered for Naruto and for his expansion on the tech with things like TBB Rasengan. He even made a fail-proof in the seal to stop Kurama from completely taking over Naruto during the fight with Pein.
Also Rasengan was much harder to create than Karin. Rasengan is change in chakra form, Kirin is just a large scale elemental jutsu. Rasengan can have multitudes of different versions that can implement change in chakra form and nature like Rasenshuriken. They can also be created and expanded without hand-seals. FTG also wasn't mentioned, and a space time jutsu as powerful as that outranks anything Sasuke has produced. Sasuke's strongest abilities are from the Sharingan and he customized one of them (blaze release).