While I don't recall seeing a better satellite photo of the LLC and MLC being stacked in the vertical I'll admit that 92L is staying under the radar , or "straddling the line" as you said. Lower level of development would lend to a closer approach of the system to the Lesser Antilles. It would also give the models a rough time with forecasts.

Closer to home. A weak trough in the Bay of Campeche appears to be consolidating. Yesterday's visible indicated a vortice on the western edge of the system. Presently there is a central area of thunderstorms and three strange looking bands separated by nearly 120 degrees around the system.
http://www.ssd.noaa.gov/goes/east/gmex/loop-jsl.html

I'll call it a trough at this point after looking at the loop. It's definately an area to watch as the BOC is one of the preferred areas for June development... normally.