A fighter doesn't have to get rocked for you to be able to tell if he's got a good chin or not! I have never seen Oliver McCall get rocked, therefore his chin hasn't been tested? Wtf kind of logic is that? You seem to only be talking about fighters' ability to recover from a big shot after getting wobbled. Some fighters get hit with big shots without getting rocked. Dos Santos isn't MMA's Floyd Mayweather, people have landed on him and he can take it.