Kinetic Fusillade and Returning Projectiles support

How does returning projectile support work with self-cast kinetic fusillade? Do all projectiles return and hit twice?

I'm looking at poe.ninja, and out of all self-cast KF builds, 13% are using returning proj. The KF skill gem with imbued returning proj is currently 50d on trade (though there's only 1 listed). So is returning proj BIS as an imbued support only, and not good otherwise?