Board Thread:Naruto Discussions/@comment-36006024-20180926134241/@comment-31099706-20180929013240

Whether or not a shinobi gets his power from, as long as he she manages to use it and even master it, it becomes their own. Sharingan was always mentioned to be a tool. Tailed beasts were also mentioned to be tools.

If you're going to talk about powers that one didn't naturally gain, then Hashi's Sage mode comes from the external source known as Natural Energy, he didn't get born with it, nor is it always in him.

While Naruto was basically meant to be the Kurama Jinchuriki, with his Uzumaki bloodline. While Sasuke was meant to have EMS with his connection to Itachi. As long as it goes with the user's efforts, it becomes his/her own.