I watched the replay numerous times and it must be said, Khan has a claim to have the weakest chin in the upper echelon of boxing. As soon as he was hit by that left, which was a reasonable shot :bbb, but not necessarily a full blooded "plant your feet" power shot he was in Disneyland :nut. His back left foot immediately started searching for the ground. This may be disproven if Prescott starts to KO durable fighters with one punch, but to me it looked as if Khan can't take any decent punch. If that is the case, he'll be absolutely KTFO by any decent punchers. I like Khan, and a guy who wins silver at the Olympics is not a bum, but he was well protected. Warren's comments after the fight confirmed it. Good luck, but he'll never be an ATG with a chin like that. Look at all the greats, they had durability. His chin is paper thin A-grade china.
It's a shame the lad can't go back to the amateurs, he'll be another Audley Harrison, pawing at the opposition terrified to be hit.
Anyone who can be floored and hurt by Willie Limond (1 KO and 7 TKOs in 29 wins) cannot be destined for the top, it's an impossibility.