Well, all systems appear to be going through diurnal processes, however remain inclined to believe 90L to be the candidate to soonest develop. A future threat to the Caribb.?? Perhaps. Any cutoff low currently in the Caribbean would not have any impact on motion or development due to the distance away from 90L. That, and the fact that while 90L is moving westward at a good clip, all other weather features are also not "static" and are moving and/or evolving. What ridge or upper low may exist one week down the road is basically "off the radar" for all practical discussion.