Thanks for posting that, Ed -- I was largely going with the NHC and their comments in the first advisory as Gamma, but the 850hPa vorticity product from UWisc-CIMSS confirms the analysis. The remnants of TD 27 pivoted around the northern edge of that SW Caribbean feature and redeveloped to the north of it in a region of diffluent flow aloft (winds spreading apart at upper levels) as the surface low to the south moved inland. It's much more clear-cut than, say, TD 10/Katrina earlier this season, albeit admittedly not as clear-cut as the remnants of TD 13/Lee.