It looks like the Buoy 41101 just missed one of 91L's centers.

data courtesy of Meteo France

It appears that there is a surface circulation located near 12N/ 57W. Or just to the east of Barbados. Slightly sheared from the south. The lower cloud circulation is visible just prior to the Sun passing overhead and wiping out the surface sue to sun glint. The circular motion can been seen in the lower portion of the photo below.

edit~danielw: To eliminate confusion. There appear to be 2 slightly separated surface circulations associated with 91L. I'll call them Left and Right as suggested.
The IR photo above is of 91L- Left or the western most circulation. In the bottom portion of the photo, a grey semicircle can be seen. This is drier air and is being injected into the western side of the main 91L system, or 91L- Right