concerning client confidences whether officially retained or they were just a prospective client. In this case, the lawyers also publicly offered themselves as GZ's lawyers. There is no way to win this by pretending they didn't have any relationship.
http://www.floridabar.org/divexe/rrtfb.nsf/FV/EABCD58E472D48F385257171005DB7A7
(a) Prospective Client. A person who discusses with a lawyer the possibility of forming a client-lawyer relationship with respect to a matter is a prospective client.
(b) Confidentiality of Information. Even when no client-lawyer relationship ensues, a lawyer who has had discussions with a prospective client shall not use or reveal information learned in the consultation, except as rule 4-1.9 would permit with respect to information of a former client.
http://www.floridabar.org/divexe/rrtfb.nsf/FV/EABCD58E472D48F385257171005DB7A7
There isn't much the Florida Bar can do, because from what the attorneys said they never had a written agreement. So Zimmerman never officially hired them.