I don't think Tony is involved. Found this thread started by a friend of someone who was dating Casey at the time of Caylee's disappearence. You'll have to scroll down through it and read some of the tacky posts. But it's interesting, and looks as though Tony (if he's the guy the thread starter is referring to, may also believe Casey did the unthinkable...
http://forums.somethingawful.com/showthread.php?threadid=2908750
Sorry if someone already found and posted this.
Rebecca
quoted from the thread...
"he said she was crazy even when he was dating her.
I think his exact words were "She was a loving lunatic".
But then again he still hung out with her on leave"