"He took a LOT of shots against Brimage" Not true, he got hit probably one good time (where it actually connected) and it did nothing
I don't remember Max Holloway landing anything of significance against him
I remember Brandao landed a right at the very start of the fight that did nothing
Poirier got him with a left that did nothing
And Siver grazed him a few times but that's more because at some point, Conor just decided to walk him down and stay right in front of him, and tee off on him. He wasn't too worried about Sivers shots, didn't move like he did in his fights against Brimage and Brandao. Just walked him down
But anyways: In his 5 UFC fights, you can probably barely remember 10 strikes that have been landed against him, and 0 that have actually effected him. So I don't think his striking defense is something to be worried about. It's not like Aldo's defense is perfect either. He has good head movement, but when he swings he tends to come from the hips and leave his head wide open. Mendes caught him a few times that way