Are you quite certain, regardless of what they actually wrote, that the defense did not mean "only presented" rather than "only preserved"?
It could be an error of some kind, but this one doesn't seem likely.
I don't think it is exactly true. As I mentioned here,
on 3/20 ABC aired a variant of 'put his hoodie on' that is probably a missing piece of the Crump interview.
I don't see what relevance it would have. The context is of supporting the claim that Crump is the only available source of the information. If ABC has it, it can be subpoenaed. It doesn't matter if it's been aired or not.
If the defense really thought ABC destroyed the rest of the recording, I don't see them not going off like an atom bomb about it.
They are going after Crump at the moment. They may be lining up some ducks before going after ABC.
The whole ABC situation is very mysterious.
If the recordings have been destroyed, including the Gutman interviews, that might explain why there still has been no hearing on the matter. Jeralyn mentioned that in the recently linked blog post.