The shooter was sighting Trump in profile, shooting at the right side of Trump's head.
When the bullet arrived, Trump was literally face to face with the shooter, and the bullet skimmed the right side of Trump's face.
Also, two of the aerial photos indicate the shooter had to fire over the extended edge of the bleacher seats on Trump's right.
My speculation - the shooter's view was blocked by standing spectators in that right side bleacher, because Crooks did not fire until Trump had been onstage for almost eight minutes.
Anyone have a video of the entire front of that building as the shots were fired? I would post a link but I can’t find it again…