That's true, he won't get that level of importance as he isn't a major enemy. But that doesn't necessarily have to take away anything from his strength. I really don't think Oda is done with him yet and that he 'isn't worth anybody's time' who's on the rooftop.
Sure, but we will never get to know King's strength since he will never get that level of importance. His "strength" will just be based on the hypothetical ideas of the "YC1/2/3" branch of powerscaling, which for the most part sucks.