What I think is that it's quite clear to Kaine, Desiree, everyone else including Terri herself, that she has not been cleared in this case. Kaine and Desiree were given clear instructions about what they couldn't say. I have a feeling that suspicions were raised against Terri from the very beginning. I imagine that one or all of the other parents were suspect of her. Now that she is being fingered and grilled by the LE, perhaps their suspicions are even increasing. Of course, they are not about to say this, but I think Desiree & Kaine were both able to say with all honesty that Terri is cooperating. I think she IS cooperating, as far as being questioned, and letting them conduct searches, etc.
I thought it was astonishing that Kaine said, during one interview that he "could not speak for Terri's reaction." To me, that's even more amazing than what he's dancing around in your quote.
What I think this quote means though is that Kaine and Terri are not seeing eye to eye about who to talk to and how much to share. I think she is frantically trying to defend herself. She is sharing information with her father and with friends and maybe even requesting that they speak to the media
in spite of having been asked that SHE not speak to the media. Well
that may be going to far. I don't know exactly what's going on, but I don't think the relationship with Kaine & Terri is very rosy at the moment. I kind of wonder if things are very rocky for a variety of reasons. Even when asked do you think LE suspects Terri, the answer is "We can't talk about anything related to the investigation." Can you imagine how your relationship with your spouse would begin to disintegrate if you thought he'd done something dreadful to one of your children?
I just think they don't know what to do. That's also probably why they didn't speak out at the beginning. I'm guessing they were fighting amongst themselves.
Just my opinion, and speculations.