The Six Paths Senjutsu is a very strong version of the regular Senjutsu, which has only been attained by few individuals.
Here are all 6 people capable of utilizing the Six Paths Senjutsu.
6. Obito Uchiha
Obito Uchiha was not adept in Senjutsu at all. However, Obito did become the Jinchuuriki of the Ten-Tails. This gave him ability to grasp nature completely, and utilize natural energy. The usage of Six Paths Senjutsu also gave him the ability to fly. This is also why only Senjutsu Chakra works against the Ten-Tails Jinchuuriki.