Name your shooter
JED....QED.
Now prove JED wasn't the shooter.
Why the closest person without an alibi, with unimpeded access to the shooter's nest, whose testimony is unbelievable, had military training, and was "emotionally" unstable is not a reasonable suspect?
As opposed to LHO, who was found several floors from the shooter's nest, having a path that it is now impossible to prove was actually clear from him to traverse. The DPD\WC could have pursued the witnesses between the 6th and 2nd and confirmed it was clear but appears to have decided not to.