Longstreet wanted McLaws line formed slightly different than Lee wanted it positioned. Longstreet believed the Union line stretched all the way to LRT. Lee believed it did not. Longstreet was correct. Giving a subordinate office direct orders in front of his commanding officer is not considered usurping anyone’s authority. Lee simply wanted his position occupied.
Was Longstreet's proposed change to Lee instructions to Mc Lawsonly slightly different? Surely attacking up Emmitsbuurg Road is very different from attacking accross it and why did Longsteet think Lee was wrong in his estimate of the location of the Union flank?.
From Mc Laws report, Longstreet was impatient(if not agitated) as he watched Lee give direct instructions to one of his subordinates, even as he watched(and seconds later having his orders countermanded by Lee, also in the presence of McLaws), was noted by McLaws, even as he diplomatically refrained from admitting why this might be so.