The guy has never actually been hurt on a KD, he just runs straight into shots. The Kambosos KD was him being severely stupid, I suggest watching/rewatching the first round.
Nah, his chin is actually fine but he sucks in general. He's terrible. And his defense is even worse. He just blocks those punches with his chin and also moving right into those shots. He's one of the most overrated fighters on the planet considering the hype and the way his promoter tries to save him with corrupt decisions. He'll be beaten up by the elite guys at 140. Prograis or Taylor would beat the living crap out of him.
I watched a little bit of the highlights for Lopez-Martin, and Lopez got lucky when he beat Lomachenko.
Quintessential weight bully. He has been blessed with many physical gifts. He's athletic, explosive, very powerful at 135, and fast but he's finding out the hard way that it's a different ballgame when you start facing world champions and talented top contenders your own size or bigger and he's going to find out real soon it's even more different when you do so against ones who can really punch.