I suppose one shotted wasn't the correct term as he was the aggressor. However it did appear as though big mom seemed not to bothered by his attack. In much the same way you or I would swat away a bug. After further rereading the chapter I concede that luffy may not have at 100 percent...
I'm not sure where else they can go with the story at this if they aren't prepared for yonko, They are out of meaningful warlords to tackle unless weevil is a tier above flamingo. I'm just surprised that the gap is so large. Even if they escape WCI and regroup with the wano team the question...
I have to admit I'm a little disapointed in this outcome as well. Luffy getting one shotted in G4 shows a huge gap in power between he and big mom. If the point of the timeskip was to be ready for the New World he missed the mark. You would think with the likes rayleigh, mihawk, and iva as...