I haven't watched, but did he understand these things prior to Summer's disappearance? Or did he learn about these things afterwards? IMO, it seems evident that he's been paying attention to Websleuths and/or other websites and forums - I say this because after every interview, he seems to come back with another and respond to questions asked in those mediums. All my opinion!
Only somebody that has experienced a missing child would ever understand, I would imagine.
I think he has a right of rebuttal when meanings are placed upon his linguistics for which no qualifying questions were asked during the original interview!
Having said that, I think he's being exploited left right and centre and he is not media savvy by any stretch of anyone's imagination.
He's not an easy interview subject, he rambles.. a lot.. but that's his way and any interviewer that does not sit and find rapport with him , for probably longer than it takes for most people, cannot possibly understand his ways of expression.
When he made his first video after the CM, the interviewer did not have the experience to ask him to qualify his statements.. she did subsequently attempt to right that, though.
He has a right to come back. He's probably fighting a losing battle. He should not be doing any of it.
I don't know that this will have an impact on the investigation, I expect it will, particularly if he , himself, becomes a chief or the chief suspect.
In relation to other possible suspects, I think names were blanked prior to broadcasts.. but it's still likely they will be recognised by his description and this could potentially prejudice a jury.
It's fraught, all of it, legally.