The Manchester 737 accident (and I flew that same fleet of aircraft for 6 years) showed the critical importance of crosswind in respect to ground fires of stationary aircraft. Although the fire damage is seriously worse on the left side, this could easily have been due to crossover of the heat source and it is indeed very possible the cause of the problem was the right engine. When Mt. St. Helens erupted, people right under the volcano on the upwind side in a light to moderate breeze survived and damage was minimal, people up to 30 miles downwind died. With a ground fire, the important thing is to get it blowing away from critical parts, and carbon based life forms.
Out of that Manchester accident developed a rejected take-off procedure in the event of engine fire, and that is to try and turn to ensure the fire is not blowing onto the fuselage. If indeed the initial source of ignition was the right engine, this incident graphically illustrates the importance of when the option is available (it wasn't in this case) of trying to turn the aircraft to get the fire blowing away from the fuselage.