Staying at the Gaylord only has the benefits of being able to safely walk drunk from con to hotel room without trouble and you don't have to deal with the weather. Cosplay is MUCH easier when centered in the Gaylord because you don't have to wear your thin, revealing outfit without running through freezing temperatures or the risk of any props/clothing falling off outside. (Speaking from my own and friends experience)
I also would reserve rooms just as a safety net in the event flaky friends flaked out. Considering how fast Gaylord Rooms went when discount prices went up (Between 135-180 a night?), I'm not shocked they are enforcing these rules. The Gaylord is picked pretty often for large gatherings cons or no cons.
Time to plot out new Cosplay.