if you believe that having the aircraft parked in the wrong place caused this accident then you must believe that.
It was clearly a strong contributory factor - it shouldn't have been parked there unless there was good reason - the close proximity of the fuel pumps (24') might have been a reason that some pilots preferred the aircraft 'off' the spot - there is a clear discrepancy between what the 2 pilots said about that process.
It was parked there because the pilot and crew rolled it straight out of the hangar to the left of the markings, turned around, and walked away.
If they had spotted it correctly, the accident wouldn't have happened. Whether you view this as the primary cause or not is your discretion, but I think it the key event.