I still don’t believe that tie fighter on the gantry was ever a marketing shot. It was like that before they developed the Tie-Strikers no doubt. I don’t see the point in lying about it. It’s actually a fairly small thing although it was visually superior in the trailer. My gut feeling tells me Jyn had a mexican stand off with that Tie Fighter and shot the pilot through the glass with her blaster. That’s my speculation on it.
It’s been stated time and again from various sources that it was a test shot. The latest confirmation came in an interview with Clayton Sandell with RebelForceRadio where he recounts ILM’s explanation for the shot. There’s no conspiracy here.