Yeah pre G5 Luffy can stop blazing bagua and can take death destroyer thunder bagua when roaring TB killed him
TWO consecutive roaring baguas killed him... one of which he was restrained and prone.
Taking a blow while prone and restrained is completely different...
In contrast Kaidou said Luffy was still at the end of his rope after coming back from death but was basically immune to any serious damage Kaidou could give out...
I didn't say Luffy could overpower Kaidou's blazing bagua in a clash in G4. That isn't needed to knock out Kaidou, that is a higher bar. In the showdown they had G4 Luffy vs awakened Kaidou hybrid, Luffy had a nonzero chance of winning, saying he had zero chance is ignoring Luffy's own phrasing in the panel you posted
"IF this isn't enough."