I like the idea that characters who have but D and CoC are extremely rare even in the New World and all of them are PK material.
Like, so far the only people confirmed to be in that club are Luffy, Ace and Roger.
Kid has CoC but not D. Law had D but not CoC. Luffy is the one who has both so he can rise to the top.
Law is fated to help bring the dawn, but not as a king, but a supporter. Kid is fated to be a king, but not THE king, the one who will bring the dawn.
So overall it's fine if Law doesn't get the same feats as Kid. That's not what his role in the story is. But he will stick around as a key character in the plot until the end.