Ill do an official debate wit you. Sasuke vs.hashirama
Cause you know using kabuto would rustle some jimmies
Too busy for long official debates now that school has started. lol, and its possible that he could beat him anyway. Might as well just get to the main point right here. How does his flying PS beat Shinsuusenju? Sure, he can cut the hands with PS's slash, but that won't cut all of them at once, meaning the ones that aren't being cut slam down into his Susanoo and he gets crushed, or 2 hands hold is PS's arms or blades, and then the rest pummel it.
If PS and Kurama failed, PS alone won't succeed.
Agreed that Sasuke can at least solo up to BSM Naruto.
BSM Naruto beating Sasuke alone is already a high difficulty fight. Kabuto can tip the scales even if a little with hindrances such as Kidomaru's webs (besides Bijuu damas, how will he remove the webs when it is stuck to him? Nuking himself?) Kimimaro's bone forest, and Muki Tensei will also be hindrances by stabbing his feet. Giving Sauce a potential win.
Madara and Hashi potentially lose to Tayuya's flute while being distracted by Sasuke.
Madara would lose for that reason, Hashirama, no, because PS can't match Shinsuusenju alone, as shown when Madara had Kurama and PS, but still failed to defeat the statue without having his own offense and defense shut down. PS being able to fly, doesn't give it the power needed to take on SS.
As for Naruto. The only issue is that he can fly, and depending on how fast he flies, he can evade Bijuu Dama. IDK if OP meant to scale the Susanoo's flight speed to his current one or Kakashi's. Even then, the AoE of Bijuu Dama allows Naruto to still hit him despite his flight capabilities, other than that, there is no issue. A slightly stronger Susanoo won't let him get past the BSM cloak, which is basically the cloak that took the Juubi's laser, enhanced with Sage Mode, nor will he tank multiples of Naruto's strongest Bijuu Dama, which can be enhanced by Senjutsu.
Bone Forest and Muki Tensei are worthless here. Neither can penetrate the BM cloak let alone the BSM cloak. Kidomaru's webs have to actually get around Naruto first, and he has plenty of ways to prevent that from happening (Rasen Shuriken, Bijuu Dama, evading them)