I think Lubin might have a weak chin. He got brutally KOed by Jermell, who isn't that hard of a puncher, and rocked by Gausha.
His chin is OK. And Jermell can crack. Let´s not forget how perfect that KO was. This content is protected Lubin ducked into a shot he didn´t see coming. Can´t really fault him for getting KO´d there. And like I said, it´s OK. A good punch will likely put him down if not out.