I found a recording of the interview (
www.youtube.com/watch?v=7VeFtHlCgws - starts at 17:45). Disclaimer - I am considered fluent but I don't consider myself highly proficient.
What he seems to be saying is that he doesn't believe the two in custody are intellectually capable of committing the crime and keeping it a secret. He says he has spoken with some police officers who have spoken directly with the suspects and they agree.
He reiterates he doesn't think these people (the two in custody) could have kept the location of Danka's body secret for this amount of time. He personally thinks there is something more to it - that someone else is involved in this, whether it's kidnapping, or murder, or whatever it is, and this [what is alleged by police] isn't the truth and simply isn't realistic. That these two men, in this way, without Danka, that they could hide their tracks and not talk about the details, they simply don't have the capacity to do something like that.
He thinks a big mistake was made by police in the beginning and as time went on, it became harder to fix that mistake. He said police started in one direction initially and when officials suddenly came out with the two suspects and the story of what supposedly happened, he personally was surprised. And as time went on, he felt more uneasy about it.
Annoyingly, the show hosts kept interrupting/speaking over him at key points. But essentially, he seems to be saying the initial direction the police were going in and which media reported on in terms of the circumstances around Danka's disappearance (he chooses his words very carefully here but I believe he is alluding to the theory/rumors that the mother/parents were involved) seemed easier to prove. But then out of nowhere police switched to an entirely different set of circumstances and suspects, which he acknowledges is fine and does sometimes happen in investigations. However he states they did that here with no evidence, no trace, no witness and still no Danka which raises serious concerns. He thinks that was a mistake. He thinks police had a lot of public pressure to solve the disappearance and while they may have believed these men were involved, he thinks they rushed it and mistakes were made. He wishes police had given themselves more time to be totally certain as to what happened and gather clear evidence. He thinks that mistake will continue to impact this case.
I did not watch the entire program but I gathered the main topic of discussion was the ticking clock and whether there would be an indictment. It sounds like the entire panel, including this man, believe the two in custody will be indicted.