You, power level junkies, are by far the worst side of this fandom; pure fundamentalists of a system you made up yourselves.
Just like confused chickens running in circles over concepts that aren't even proved to be a thing in the reality of this story, and then wasting who knows how many time discussing literal nothingness. I mean, what is even a "YC4"? What defines a "YC2"? There's a reliable rule that equals hierarchy and strength when it comes to comparing the commanders between crews? Probably not, hence why, when this obviously flawed, limited concept falls apart, people need to come up with nuances such as "YC1.5", "YC0" or said "YC4", which wasn't even a level before Snack was first mentioned. Because Marco, Katakuri, King, Queen, Beckman, etc. aren't "YCx", they are characters moving in a fluctuating spectrum of strength that, on top of that, changes on the basis of Oda's narrative wishes.
Is there any actual way for you fundamentalists to conciliate your simplistic, completely alien-to-One Piece understanding of "power scales" with facts like Usopp being able to defeat Arlong's top three subordinate a couple of days after leaving his humble village? Or Sanji going from having trouble against Blueno to defeating Jabra after being defeated himself and, yet, coming out of the fight fresh enough to face the Navy? Or off-screen battles running for way longer than on-screen for obvious narrative purposes? Or Luffy winning against Katakuri purely because he's a glutton with a rubber body and was therefore able to release himself from Mirror Mochi by eating it? Or... well, should I go on? "B-but Sanji is too weak, he's a YC4, he can't face a YC whatever!". What a laughable, narrow-minded, dishonest approach to how this story's "power levels" have worked since day one.
The greatest irony with you junkies is that the part of this manga you enjoy the most is the part you understand the least.