Ken Rosenthal lays out what he thinks the reasoning was behind Arizona's willingness to get rid of Upton:
The Diamondbacks want a certain type of player - single-minded, outwardly intense, fierce. Cody Ross is that kind of player. Martin Prado is that kind of player. Upton, according to one of his former teammates, is not - at least not in the perception of Diamondbacks GM Kevin Towers and manager Kirk Gibson.
"The problem is that he didn't play with a high level of energy," said the former teammate, who spoke on the condition that he would not be identified. "What I think they want is guys who play with the speed, energy and intensity of the Oregon football team - all out, all the time.
"Justin doesn't have that kind of attitude; he has a quiet intensity that doesn't fit the mold of what KT and Gibby seem to want. He plays hard, but has to look suave doing it. Slamming into walls isn't his thing, and they will accept nothing short of all-out sacrifice for the team."