You can make arguments for King being above characters like Katakuri and Marco, but you can't make any arguments for King being above Ben because unlike the other YC1 we still haven't seen Ben in action.
It still doesn't change the fact that Ben's name was mentioned when they went over the Yonko's bounties and King's name wasn't.
Again do you actually think Oda isn't going to hype up Ben once we see the Red Hair Pirates in action?
Why the fuck would I want to argue about Ben vs King with you in the battle dome, seeing how we haven't seen Ben in action nothing so far proves he is above King and also nothing proves that King is above Ben.
It would just be my headcanon vs your headcanon, it's fine if you think King is stronger than Ben however don't treat it as a fact until we see Ben in action.
There are few things you should know before.
"Once we see the RHP in action", nop not really. The only fight we might see will be BB vs Shanks and not others commanders of BB vs RHP fights since Oda needs to keep their abilities hidden to reveal it only when SHP will face BBP.
Especially not Ben Beckman vs Shiryu since the latter is gonna be Zoro's opponent.
Now another thing : Ben can be equal or below King, it doesn't change the fact Shiryu will beat him. So Shiryu (who beat Ben) can face Zoro (who beat King), nothing to worry.
Kaido is stronger than Shanks, so King being stronger than Ben Beckman is nothing surprising.
Marco also was hyped by Gorosei to be able to stop BB, well he didn't and today King looks stronger than Marco.
So absolutely nothing put Ben above King since Ben will never face Zoro or any SHP.