Dumb example, You use Minato saving his son while planning to sacrifice his life to seal Kurama in Naruto so he was going to die regardless. Kushina even stated that Minato could have used other seals but Minato wanted to make Naruto a Jinchuuriki instead of just sealing Kurama so that doesn't count as Kurama soloing Minato when Minato was already going to die on his own accord.
Technically Itachi didn't 1 shot Sasuke in there fight unless you're talking about Academy Sasuke and Genin Sasuke which would be a great feat for a kage level.... not. Itachi never 1 shot Nagato, please show me manga proof of this that does not include a Kabuto controlled Nagato who didn't want to fight. Kabuto solos Itachi, he was beaten by Sasuke and Itachi. Sound genjutsu solo Itachi, it was plot so get over that one.
Sasuke had no intention of stopping the Edo tensei of free will, he was aiming to kill Kabuto and failed. Itachi was telling him not to kill Kabuto over and over again. Sasuke only helped out to talk to Itachi who kept saying he was business with "Something I have to do". Minato Sacrifice his own life to make Naruto a jinchuuriki when Kushinastated he could have used other sealing jutsus to seal Kurama. His sacrifice went on to saving konoha from Gaara who was in BM form from destroying the village, changed Tsunade's heart which stopped her from healing Orochimaru's arms and become Hokage, saved Gaara from Deidara with Kakashi, changed Sai's for the better, protected konoha and become a hero, sensed out all imposter zetsus in the war, and ultimately turned the tide into the alliance favor and is what will save the world overall. Minato left Naruto with the power to save the world.
Overall, Minato/Nagato/Hashirama/Madara are all solo kings
Sasuke had minimal help against Danzo (Tobi warned him to move and Karin was helping with her senses), I guess soloing a bed ridden Orochimaru with a surprise attack is a big feat when Naruto fought a healthier Oro and almost killed him. Sasuke solo team 7? You mean with a weakened Naruto? Right, 4 tails would wreck him. Naruto said it himself
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Obito is solo tier but I don't remember him soloing Shikaku.
Hashirama is solo tier.
Hiruzen soloed Orochimaru only, the Hokages had no control so it wasn't them.
Minato still soloed Obito, juubito is another story. Minato soloed platoons of ninjas in the 3rd ninja war. Soloed A and Bee (A said he thought no one could surpass Minato).
Kabuto soloed Itachi and Sasuke in their fight. Itachi protected Sasuke when Kabuto could have takened him or killed him more than once and Sasuke saved Itachi as well. Without Sasuke, Itachi wouldn't have broken out of the sound genjutsu. Plot made it so Kabuto didn't just undo Itachi's edo from the beginning, If Itachi was undo when he made Kabuto end all edos then what stopped Kabuto from undoing Itachi's edo from the beginning of the fight? Plot.
Nagato was never soloed by Itachi since it was Kabuto controlling him and it was 3 vs 1... Nagato solo Hanzo, 6 tail jinchuuriki, konoha, Jiraiya,and Naruto who had help by Hinata, konoha and Jiraiya.
Naruto has the power to solo anyone alive but Juubito.