I think it helped Caro that she is not shy at going hard at anyone. She got good info from baker/mckenzie, saw the bleeding obvious and went hard at Hird for last 6 months unlike others who just don't have the guts (read Garry Lyon, Andy ****** Maher etc)
Caro was also used by the AFL to run a massive PR campaign against Essendon.
IN the end, as the charge sheet was whittled down to nothing - what do we end up with?