The line above Diablo's waistline could simply be a printer's crease that was always there from Day 1, though those usually run from the outside edges... it could also just be a wrinkle that appeared from handling over the years that was flattened out from the press. The color loss by the Thing's elbow could be something that lifted off due to a bad press, or it also might have resulted from a bend in the cover and subsequent rubbing over the years, as well - tough to diagnose without the "before" pictures as a comparison.