100% Kyuubi is stronger than BSM with a Kyuubi Chakra entity which is smaller and possesses less Chakra, what isn't obvious here? Kyuubi himself is durable engough to tank Chojo Kebutsu and Chibaku Tensei..so no doubt.
Madara > Sasuke as for now, as his PS is bigger and slices mountain ranges with one blow. You say they surpassed Madara and Hashirama now, but by what feats? The whole alliance is fighting Obito and Obito lost this clash due to his own doubts, when this was a fight of wills.
Either Madara or Hashirama solo for obvious reasons. Madara controlled 100% Kyuubi and armored him with his huger PS; the combined version of Sasuke and Naruto is much weaker. Hashirama on the other hand overwhelmed even that with Shinsuusenju and has the important advantage with a Chakra absorbing and supressing Mokuton, which is above all enhanced with Senchakra in general, Mokujin, Mokuton Dragon and the gates which restrained Juubi.
By feats Naruto is stronger than 100% kyuubi. It's been stated several times that Jinchuuriki are more capable than their bijuu counterparts, Obito now compared to just the Juubi is an example of that. Less chakra does not = less power. So what if the kyuubi tanked Chojo Kebutsu Naruto tanked the Juubi's laser which is far above that and tanking chibaku tensei is Naruto's jinchuuriki feat. Naruto's shown far more destructive power in bm than the 100% kyuubi and the tanking feats speak for themselves. So explain to me what's obvious here? I haven't even bothered mentioning sm's boost.
Sasuke's ps > Madara's ps. Unlike Madara's Sasuke's comes with enton, there's no doubt Sasuke's sword swings can also do what Madara's have done, considering all susanoo's tend to work in the same way. As for size, you got any proof? I've got this,
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It's laughable that you think either can solo. Going by power scaling Naruto and Sasuke > Obito > Mindless Obito > Hashirama > Madara.
Naruto's Sage mode is inferior and Kyuubi is inferior to Mokuton
Madara possessed their current combined power.
Proof on the first point. Naruto's bm combined with Sasuke susanoo is similar to what Madara possessed but it's not the same, what Madara used is outclassed by the duo.