I keep thinking to back when casey wanted to talk to Tony. At first, I thought it was self-serving, my boyfriend, etc.Agreed. I think Tony was as cooperative as possible. He was probably shocked when Cindy yanked Casey out, then the police showed up and started asking questions. I'm sure he was shocked to be involved in any of this.
Although I did think the "strange guy's house" line of questioning was a little out of no where.
But maybe Tony actually knows what happened to Caylee.
Reasonable doubt if they have no forensics. JMO.