Firstly, follow
@Cinera's template and wank Admirals even more. Secondly, not be surprised at all. Luffy beating the odds is a normal pattern in OP.
And I keep bringing Lucci in W7 over and over again for comparison purposes, even though many think the comparison is not justified. I think it is completely justified and Kaido one-shotting Luffy has no bearing on anything.
The concept of OP is that when push comes to shove, you can count on Luffy. Even in Marineford, where he was outclassed in every way, he got the job done. So, Luffy will get the job done here too. And while many Zoro fans will be utterly disappointed by Luffy soloing Kaido, it is not a new level of bad storytelling or anything like that. It is the normal service.
To be honest, the fact that Oda created a narrative where most of fandom don't believe Luffy can solo Kaido is NOT the normal service by OP standard. That is the BnHA standard.