And besides, I can only speculate that they have seen the weight issue already and did try to compensate and losing those extra baggage by doing lots of drills resulting to another factor that affected his performance.
Trying to lose weight hours before a fight is really an agonizing task and that might result in hurting yourself that is why I'm inclined to believe that the weight issue was the biggest factor why he loses the first fight aside from the fact that Martinez was a replacement fighter.
There are lots of cases where a boxer who is overweight during the weigh-in and happen to make the adjustment to meet the minimum requirements often underperform. Even the legendary Manny Pacquiao lost 2 matches due to overweight problem. So it is rational to think that the weight problem plays a huge part. And also the replacement also plays some part in the loss too. Imagine you are preparing and practicing the strategy laid for your opponent for months, then all of a sudden your opponent cannot make it to the fight, and a replacement is announced.
It is easier to practice a strategy when a player is at its initial preparation than to change strategy after practicing for months.
Just take a look at how Shakur handled that weight issue, he never minds losing the belt rather than hurting himself to shed those excess pounds during the weigh-in, might be a good idea because he performed really well but we can only speculate that if he decided to make the weight he might have lost the fight.
Shakur knew he has a huge possibility to lose if he pursues his belt, and he choose his record over the title so he gave up the moment he felt that meeting the weight will have a huge possibility to cost him the fight.