King's placement here is odd because he isnt seen in the same light as other 5(Kaido, WB, Roger, Shanks, Mihawk).
However, considering that Oda has been intentionally secretive about King, it isnt too wild if he is greater than expected.
However, that needs to be confirmed and so far, nothing places him on the same pedestal.
One thing he has going for him is facing Zoro and doing better than Kaido against him.
The issue is, everything Zoro-related is downplayed even with evidence so you know what you can expect for things without evidence...
Even if Oda himself would say that King is comparable to the other 5 candidates, Anti-Zolo Pirates would still use their headcanons.
However, it is not too late for King to prove that he is worthy of being listed with those you mentioned.
Him and Kaido going to MF and facing RHPs is a good start if Oda expands on it.
If King split the sky with Shanks, some people would piss their panties. :yasu: