"Armchair Quarterbacks" and After-the-Fact Generals, as well as ANY hypotheticals are, to me, all garbage. History happened, and any "What if's", or "I'd have done it this way" means nothing; as we have the benefit of hindsight.
Those on the field had no hindsight to benefit from. All they had was information passed on to them from a variety of sources as they knew it, or perceived to have known it at that immediate point in time.
"What if Gettysburg NEVER HAPPENED??......"What if Lincoln fell in the bathtub in June, 1861, and split his head open??"....."What if an anonymous soldier fired a shot from Ft. Donelson, hitting a guy named Grant in the head??"........Speculation, with hindsight, makes for a LOT of geniuses!!