People forget that Sasuke trained to react to Naruto's kyuubi cloak form as he said when he fought Bee.
Orochimaru was dying and extremely sick, and he was still playing with Naruto. He was also able to react, even without the Sharingan.
Naruto doesn't even know about the partner method to breaking genjutsu at this point either, nor does he have any control of himself.
Kakashi and gai were easily going up against multiple beasts in this form and were doing fine, yet Sasuke can't?
Kakashi's lighting techniques were able to pierce the beasts, but Sasuke can't?