Cindy, if it remains and helps to enhance the trough to its west a little bit, could weaken the western periphery of the subtropical ridge and allow Dennis to recurve a bit further to the north & east, placing Florida more in line for a direct hit, but that is still way too far out there to tell with any large degree of certainty. Better bet is that Cindy weakens and/or moves far enough to the north not to play such a role (or only a cursory one) with Dennis.

Re: question about Earl earlier -- Earl was a lopsided storm, likely with some enhancement from a mid-latitude trough, that reached hurricane status with winds of over 100mph. It made landfall in the Florida panhandle, bringing both wind and rain to the region, and is likely the best example of the peak intensity that such a lopsided storm may reach. Cindy has a similar appearance on satellite, though I am not going to go so far as to say a similar result may be seen with this storm. Truth be told, I believe that this current round of organization is all for Cindy, with a peak in intensity likely about 6-12hr before landfall. That doesn't mean, however, that it won't bring a lot of rain and some wind to the coastline.