I think you could be right, Rippersnapper. The last person Amy was seen with, was a member of one of the ship's bands. She was seen with him, on an elevator, the morning she disappeared.
The C & C bar was mentioned in the Amy Bradley case. That is a huge link with this case.
On Sloot's site he had pictures of Carlos away from CnC's. Carlos outside ata cafe type place with food on the table. More than just a bartender/client relationship.