In the movie Gettysburg, John Reynolds is portrayed as the hero of the first day of battle.
While I would agree that Reynolds brought his I Corps swiftly and ably onto the field, his actions while on the battlefield left much to be desired in my layman's opinion. Rather than leading individual companies and regiments into the fight (which sadly led to his death), he should have managed the deployment of his divisions, especially his 1st Division. As a result, the Federal 1st Division was easily flanked on the right side by Davis' brigade, imperiling the entire corps.
Sometimes it's best not to lead from the front.