Just speculation on my part, but I believe most of what happened between Carl and Terry had to do with Terry's relatives, and their persistant accusations against him. He's said previously that he wants nothing to do with them.
Yes, there was an interviw with Carl not long ago, where he mentioned that Terry's step mother and sisters actually raised money to hire investigators to try to get enough evidence on him and have him arrested for JC's kidnapping. Now they know that they were very very wrong and I hope they feel very bad about it, but seeing what kind of people they probably are - they probably have no remorse at all. That was a cruel thing to do and they owe him an appology - big time. If I were in Carl's shoes, I would really have a hard time accepting any kind of apology from those vultures and would probably not accept any BS excuses they tried to offer up to me.