I think since Tiger Woods and many other scandals, men have realized they can't try to conceal past affairs, the women will go either to the police or the media.
In the two initial interviews, June 29 and July 1, it's evident MS had decided to act like an innocent husband and cooperate fully with LE.
It wasn't until July 7 that he retained a lawyer and refused to cooperate. I was speculating why...
Firstly, he'd know through his mother that LE were very focussed on the security alarm and the oddities around that, and perhaps for the first time realized it pointed the suspicion at him.
Secondly, he'd had a chance to talk with CWW and perhaps learn some things that scared him: that CWW had brought in JR, who MS didn't know personally and so perhaps didn't trust. Possibly also that CWW had told AW he was going to the Sievers home and she had shared this information.