How has Sasuke showed his power more than any other character in the war? Quite frankly, I think people are really overhyping what Sasuke has done. Itachi did most of the work against Kabuto. The juubi, Obito and Madara all brushed off Sasuke's amaterasu flames with ease. Sasuke's susanoo would have been negated if it weren't for Naruto and Juugo's senjutsu. The chakara from the bijuus that Naruto had was what allowed the bijuus to be pulled out of Obito and Naruto's senjutsu allowed Sasuke's sword to break the nunoboku sword. Gamakichi and Naruto were the ones who exposed Obito's weakness (not Sasuke). Minato saved the alliance twice (not Sasuke). Orochimaru was the one who revived the edo kages. Naruto, Bee, Gaara and the bijuus are the ones who have been fighting Madara. What has Sasuke accomplished? The only good thing that he has really done is revive Orochimaru. People give Sasuke the credit foe reviving the edo hokages because he revived Orochimaru and they call him a solo king, but the fact that he needed Orochimaru to do it means that he did depend on someone else.
Lets review the facts:
1. He depended mainly on Itachi to stop Kabuto.
2. He depended on Orochimaru to revive the hokages.
3. He depended on Juugo and Naruto to help him even be effective against Obito.
4. He hasn't really helped against Madara.
He is not a solo king. He is way too overhyped by people like Solo, Smd, Akautski Church, etc...