So, I stopped by the dealer while out running errands this weekend to look at the headlights on other GTs w/ Tech. Sure enough, they all appear the same, with the little gap around the top center screw just like mine. I'm wondering if its supposed to act as some type of check valve or vent to help moisture to escape? Either way, the salesman showing me the other vehicles definitely thought my lights looked crappy after just 7 months of ownership, and mentioned he was unaware of any other customers experiencing the same thing.
He offered to bring me over to the parts dept, but I declined, mentioning that I'll be back at some point for an oil change, and to have them check out a tailgate rattle.