2nd: Kirin is not at same level as Rasengan Shuriken as demonstrated before. RS penetrates Susano'O and Kirin doesn't.
3rd: It's irrelevant if Sasuke can activate the amaterasu shield as the BM Kagebunshin can still land the hit it might burn but the nine tails chakra will keep the flames away long enough to land the blow, and then the kagebunshin will simply vanish. As for trying to hit the clones with anything that's simply unrealistic. BM clones are way too fast for anything Sasuke has in his arsenal.
Not to mention that Sasuke won't be expecting Naruto as he is. He has yet not seen Naruto's current speed nor power and won't be expecting not to be able to avoid a blow.