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He got the call from Mary because they speak quite often.
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LE and TBI say that they did not pick Don up. Mary calls Candus that next morning and Candus continues the charade, pretending Don is still gone. Then after the YouTubes come out, with the story of the arrest, CANDUS POSTS THE "WE ARE HOME" statement, in order to discredit everyone.
CM was right to reveal the hoax publicly. He is showing the public what this couple is really up to. It is important for Summer's investigation for this kind of truth to be revealed.
I disagree with your statement that >>>"None of the nonsense has shed any light on where this poor child is. It doesn't even seem as if she's the main goal anymore"
This nonsense does shed light upon Summers disappearance. It shows us what her parents are capable of. It goes to Candus's credibility. Shows how deceitful and manipulative they can be. And I think that was CM's goal when he revealed this hoax.