Keep in mind that he twisted his knee in the first round. That in and of itself would drain the energy of anyone especially when you have to compensate with your other leg. Other factors include the fact that he came in at the heaviest weight of his career and that Danny Williams was, like, 60lbs heavier. All of those things are factors, not just excuses. I think he looked great up until he got gassed and, ultimately, knocked out. I also think he waited too deep into the count to try and stand. Had his hand not slipped off of the rope he would've gotten up in time and, IMO, would've lasted the round. Remember, he was winning on everyone's scorecard before the knockout. Just like Roy Jones, Jr. while they may seem like excuses, there were factors that affected the outcome. I think Tyson should have, at least, 1 or 2 more fights before throwing in the towel. Danny Williams is a nobody that got lucky. Antonio Tarver, while I think he is a good fighter, got lucky. A win is a win but a long career is a whole other matter.