I was just watching the Tropical Update on TWC and they showed the visible and I think I know what you mean. On the last frame I saw a small curl occur on the SW side of the system. The question of "Did it just close off?" popped up in my mind. You may well be right.

Also, Steve, the GFDL continues to put fear in us Floridians. The latest run shows a strong category 3 making a beeline for us from the south! I'm not putting much faith in this model or any other at this point though. But given the fact an anticyclone will build in tomorrow we may just see this type of intensification. Hey, one of these days the GFDL is bound to verify correctly on track and intensity for a storm.