Captain Bryan does not work for Captain Marvin. I believe that occationally they will pass passengers back and forth if one books up as I've read that before...
From what I understand, Captain Marvin doesn't even own Captain Marvins anymore, he sold it. He still does some of the charters but he doesn't run the company anymore, they just use his name.
The best operator by far that runs stingray city charter trips is
Red Baron Sailing Charters They have a great sailboat and take up to 10 person so you don't have many people with you just the ones you know
Sailing is a wonderful addition to the trip, its like two excursions in one as you can get involved with the sailing if you are interested, I learned a great deal in short time, Mikey is a great instructor. My kids talked about this excursion for months !!!