According to Henry Pfanz's book, The Second Day, there is a historical dispute as to how far General Ambrose Wright took his brigade of Georgians up Cemetery Ridge during the second day of the Battle of Gettysburg. According to Wright's after-action report, Pfanz writes, his units reached the crest of Cemetery Ridge and he was able to accurately describe union troops on the Baltimore Pike -- something that he would not have been able to see from below the crest. This would put the high-water mark of Wright's brigade as far up as the widow Leister's house before Stannard's Vermont troops counter-attacked and caused heavy losses on Wright's left flank unit, the Georgia 48th, and well-beyond the high-water mark of Pickett's charge on Day 3. Pfanz further elaborates that Wright's account is bolstered by his personal report to Lee where he said it had been relatively easy to charge up that hill, perhaps causing Lee to commit Picket's units to reattempt the assault the next day.
I find these facts persuasive, but I note that other historians dispute Wright's claim nevertheless and believe Pickett went further. What facts do critics muster to counter Wright's claim? How did Pickett's high-water mark come to be the definitive furtherest line of advance on so many maps and descriptions?