I guess he didn't take notes at Fredericksburg... My complaint isn't that Pickett followed orders; my complaint is that he bitched about it afterwords, particularly when he was so keen to march straight up the middle. He was also bitter towards Lee afterwards, so we could infer that his loyalty had a limited shelf life.
Although I do have to say that if you or I had been in Pickett's situation later, we might have seen Longstreet's point, especially with the benefit of hindsight, and might have possibly harbored just some small vestige of resentment after the fact as well.
Maybe.