Haki is the ONLY thing that takes you that far, anon.
Many top tier DFs get fucked by trying to go to the New World without Haki.
But there are many people without DFs and only Haki that thrive in the New World.>>179856665
CoA stops the DFs effect and turns the user into a normal human, anon.
Rayleigh did that with Kizaru.
It would do the same with Magellan.