Okay, so King knew for a fact that BM couldnt fight him? He had special intel that BM didnt have Zues? Or King didnt even know a yonko could fight in the air?
Kaido: If they make it onto the top of the water fall, it will be war!
King: say no more fam
*King goes to stop their ascent
His intention was to stop the ship coming up. That's it. Not to fight a Yonko crew.
You are making a false comparison and you know it. Cracker proved he could beat Luffy 1v1. Has King showed the ability to beat a Yonko crew by himself?
Cracker > Doflamingo. No amount of fanboyism is going to change the facts on the ground. Luffy played ping pong with Doflamingo and would have beaten him even without help according to Oda. Not the case with Cracker.