Hmmm, I'm thinking more along the lines of what we saw Obito do. He put Kurama under his control, and if anything, it/he seemed to get dumber. Anyways, though, I don't think Sharingan control will be able to make a Bijuu go all out. Such as, Naruto works in perfect harmony in Kurama, and they can control every movement, whereas Madara/Obito puts Kurama under his control, and it/he just rampages around, but it's specific movements can't really be controlled. Eh, who knows. And yeah, we'll have to see how Naruto fairs against Madara, and how PS and BM stack up against each other.
That's true, but I'm just pointing out that Naruto's power level is definitely up there with the big boys (Madara, Hashirama, Obito) as of now. He can overall cause similar damage to Hashirama as Madara did due to his chakra roars, clones, FRS, immense stamina to last long, and his TBB's (which seem to charge quicker than Kurama w/o a Jinchuuriki).
Yeah, we'll have to see how Naruto surpasses him. We'll be able to make a better judgement when we see Naruto's fight with Madara.
True, 100% Kurama's got the size and more raw power, but Naruto's got the advantage of not feeling pain, more mobile/quick, and the ability to just work in harmony with Kurama much better than Madara did. And he's always got KM and SM to fall back on as a last resort or to distract Hashirama, or something. And hmm, well, again using your tiers, if Obito is bloodlusted (meaning Izanagi, Kamui, TBBs right away) with manga knowledge while Hashirama is IC and with no intel on Obito's Kamui or Izanagi (which is really bad to be up against), I'm certain that Obito would win almost every time. But we'll have to see Madara vs Naruto to get a general feel of how Hashirama would stack up to some current top tiers like Sauce and Obito.