Board Thread:Wiki Discussions and Support/@comment-25306941-20141104194639/@comment-5936871-20141104195815

I doubt it was a temporary power-up. The seals were used to seal Kaguya, and even once they faded and she was sealed. Both of them retained their power-ups. Once Naruto and Sasuke get healed, Naruto will probably regrow his arm and then regrow Sasuke's arm for him. Also, I doubt he used Creation of all Things.