Board Thread:Manga Discussion/@comment-45676454-20200905112525/@comment-38952966-20200905164139

They're actually the same Stand, when you think about it. One is just altered to fit the rules of the new universe.

Jonathan's Hermit Purple allows him to use Hamon in new ways by conducting it through his Stand, via spirit photos and technology manipulation and... whatever it is DIO did with it when he took control of Polnareff. Basically, it lets the user conduct Hamon and use it in ways they couldn't before.

Tusk is the exact same thing, but for the Spin. It allows Johnny to use the Spin in ways not even Gyro was able to fully understand, like the moving bullet holes and spacial wormholes, hell even from Tusk's first appearance Gyro was confused about what Johnny was doing and how he was doing it.

Tusk and Hermit Purple are actually the same Stand, Tusk is just adapted to fit a universe where the Spin exists instead of Hamon.