Given Zoans have their own wills now too and Luffy seemed different when awakened and that awakened Zoans can lose themselves too, maybe Nika (Joyboy) is influencing Luffy and thus if Luffy loses his DF, he might be free from it taking over potentially and thus regaining his free will/freedom and not being a slave to prophecy/fate/inherited will so much?
I'd love to see Blackbeard give us an evil, menacing, horrifying, dark etc version of Joyboy too. True toon force horror?