Naruto was the one that was wielding Senjutsu Chakra, therefore it was essentially him that made the attack effective. You also need to take into consideration that without the K11, they wouldn't have been able to bring down the shield.
You could also argue that because Sasuke was getting a boost from Naruto, giving that he was withing his Kyubbi aura. Which gives you massive chakra boost as well as replenishes it.
This is the picture of the attack....
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You can see here that Kyubbi had to physically attack him with the sword.... Sasuke merely produced the sword, which is incredibly durable, i will say that.
My point is that no matter how you look at it... Sasuke did not do the most of the work, it is in no way "His attack"