Khan got knocked down by the likes of Limmond and a shot Gomez(who's a D+ fighter in his prime with no power). That's all you need to know. All this horse dump about Khan being healthier at a proper weight was proven to be a joke and nothing but an excuse to save face and further resume his career, quite similar to his "my trainer(s) should be blamed" excuses.
Khan got floored and rocked by Julio Diaz. He got badly rocked by Maidana. He was knocked out by Prescott. Fighters who have good chins don't get knocked down 9 times in their career (One of the announcers said it was the 9th time Khan went down in his career during the Diaz fight). He also takes a long time to recover. That's why he got knocked down again so early in the 4th round of the Garcia fight.
People give Broner credit for surviving against Maidana and not getting stopped despite getting dropped 2x . But then people **** on Khan because Maidana manage to rock him and hurt him with 1 punch . Yet he never came close to going down at all . Do you see the difference here ?