The missing person is not a crew member of Carnival Triumph. He is a security officer for the shipyard. The winds in the quickly strengthening storm not only caused the cruise ship to bust loose but those winds also blew away the guard shacks, and this is where the missing man was stationed.
I've since learned that the winds were so strong they actually caused the concrete footings for the bollards at the Carnival Triumph moorings to fail. In other words, the lines from the ship to the pier held, but part of the pier collapsed.