You stated ..........
"Very Unlikely to be a Parachuter caused."
Well, it does look like damage that would be caused by the Convair accidentally being pushed by a tug into something or by a vehicle (such as a de-icing machine), etc, etc, but, I figured that the remarks by the photographer were more likely based on his actual knowledge of the incident instead of a hypothetical scenario involving someone hanging from a parachute.
Why would the photographer mention a parachutist for no reason? I wonder?
Anyhow, I agree with you about the bird droppings. I thought of that at first, but then I thought ...."what the heck are those birds eating that would cause their droppings to melt through paint!?" Those marks also look like mold.
The photographer mentioned ...."I guess this won't be flying anymore."
I disagree. Why not? A rudder can be fixed. But then again, if the company can't afford a paint job, they probably can't afford to fix the rudder, etc!