User blog comment:B214/General Discussion/@comment-24098614-20170331211533/@comment-29963364-20170331234945

True. But you gotta remember something:

Pure-Blooded Devils don't usually train. They rely purely on the powers & abilities they were born with, and those that they aquired later in life as a by-product of their experience(s).

So the same would be the case with Roygun (and the rest of the cheaters). Roygun only used the King Piece because (besides training) it was the only way for her to actually be able to compete with the top players in the Rating Game.