That he ended up with L's for his biggest fights vs Tito, the two Mosley fights, Hopkins, Mayweather and Pac together will have a more significant impact. However unfair some of those decisions were. If he'd rightly been given the W vs Tito and victory over Mosley, he would've had only one loss which he avenged by the time he moved up to 160 to challenge Hopkins. And this having fought the best. He would've been seen to have cleaned out welter when it had the best fighters (long reigning champs Tito, Quartey, Whitaker), to go with his smashing of the long reigning 140 champ and legend Chavez, and winning 2 of the 3 major 154 titles. Basically would have been seen as having been the man from 140-154 and remained in the top 2/top 5 pound for pound lists much longer and his ATG criteria would be much stronger. His losses to Hopkins, Mayweather and Pac would've been forgotten more easily with him already having beaten so many great fighters in his prime. But as it stands if people look at his losses and say he lost all his biggest fights, you can't say they are wrong as that is what will be written in the annals of boxing.
The loss against Tito because 10 year's from now, people will remember it the most and put aside the loss against Pacquiao because it was at a point in his career when he was already diminished. Similar to Chavez, who people remember his great fights but put aside the losses against De La Hoya because he was faded then.
Neither. He beat Tito convincingly and was a corpse against Pacquaio. I'd put the Sturm 'win' as his biggest mistake.
Running against Tito. That was unforgivable, but what was more unforgiveable was the decision going to Tito. That bull**** decision was almost as bad as the Mosley-Mora fight.