The "plumes" and the surface oil are driven by totally different mechanisms. The underwater stuff is mostly transported by the currents, as you mention. The surface stuff is mostly driven by prevailing winds, which, at this time of year.
But by the time the underwater "plume" gets to the Keys/Cuba (and certainly by the time it gets "east" of Florida), I think you would be hard put to detect any oil at all, given that it has been diluted to 0.5 ppm after traveling only 42 miles.
I’m counting on it WW! It’s awful pretty around here. Gator trout, red fish, snook, grouper and red snapper are a real treat. Hate to see this happen to any Gulf State.
Thanks for a voice of reason and information. I remain hopeful.