Let's round off some numbers. Brady = $2 million and Graham = $5 million
Now, do you think that the Patriots would have paid the extra $3 million if they knew it would have won them the Super Bowl?
Of course they would have. However, they didn't have the benefit of hindsight. They thought they could replace Graham's production with a cheaper tight end. They were wrong. For most of last season, that didn't matter. However, in the biggest game in NFL history, it mattered a great deal.