I really admire all three. Buford and Reynolds didn't win Gettysburg but they kept the Union from losing by their recognition of the key terrain and their willingness to fight for it's possession and defense.
Equally, Longstreet's advice to Lee harkens of Guderian's to Hitler when discussing Kursk-
"In that case your reaction to the problem is the correct one. Leave it alone!"
A different story, perhaps, had Lee done so.