This. A good punch resistance is great but if your overall boxing skills suck and you cant fight for ****, then you can have a rock jaw still wont help you. There are more important attributes then a good chin. Plenty of fighters are a example of this.
Yeah and look at all the guys he avoided. So, I would say he did agree or he would have fought them. Jones avoided savage punchers like the plague.
But according to the ChinCheckers, anyone who's been KO'd, knocked down, or rocked has a glass jaw. They've even said that most fighters have some degree of glassiness.