And of course there's the matter of Johns' recent Emotional Spectrum buildup, which the Mask fills pretty well - Green Mask creating things, Yellow suit causing fear.
If DC ever instigates another crossover, they could have the Guardians and Sinestro filing the cosmic equivalent of a joint patent infringement against the Mask's mysterious carver...only for it to fall into the hands or rather onto the face of, say, Doomsday. Or Mogo. Or someone possessed by a Starro.