The odd and wonderful world of One Piece may be in increasingly desperate peril with Vegapunk's revelations, but that doesn't stop the power of hope in a free future. As Egghead is torn apart by the terrifying Five Elders, and the Straw Hats mount their retreat, Luffy's Gear 5 form alone wasn't enough to stop their enemies.
While it might be fair to assume Luffy was the only Gear 5 user in One Piece , that's not strictly true. While the Gears are his own naming scheme, the invocation of Nika, in his case being the awakening of his Devil Fruit, can come from other means. As shown in One Piece episode #1151, Bonney has cracked that code.
One Piece's Anime Debuts a New Gear 5 User
The Drums of Liberation Grow Louder
Bonney realizing how she can imitate Luffy's Nika powers in

Screen Rant

Raw Story
Los Angeles Times Politics
The Conversation
AlterNet
WYMT Sports
Tribune Chronicle Sports
The Daily Beast
America News