stormchazer -- probably just a sign of the differentiation between the well-defined core of the storm and an outer convective band and not a sign of dry air entrainment. I could be wrong, but I don't believe that there is dry air becoming entrained into the storm.

Big Red Machine -- probably not, as there is still likely an eyewall replacement cycle ahead (and shallower, cooler waters) to slow/halt intensification, but we don't know how strong it is going to get before then. Camille was a once-in-a-lifetime scenario and is the furthest north category 5 hurricane in Atlantic basin recorded history; I think Dennis is not likely to approach those levels. This may be a similar scenario to Opal in 1995, but I'm not willing to call for such drastic weakening right before landfall.