What more King downplay do you need? getting his weapon thrown away because of a shot from Izou. Then letting Sanji save Momo and getting away. Then letting Marco just take Zoro and leave him at the roof, even with the help of Queen they couldn't stop him. Now King is occupied with Marco and can't leave to kill the scabbards, so he sends the Flying 6.
King is by far the most incompetent YC1.
But i can downplay King a lot, he has a cool fucking design but is the most meh YC1 for me, and still tell you, Sanji vs King ain't happening.