As to why he didn't do the interview - I wonder if he was caring for his daughters. Their mum has just gone missing without explanation; I doubt they want to let their dad our of their sight.
I have a working cocker, who looks similar in breed to Nicolas dog Willow. He can slip his harness if it isn't on tight enough. I wonder if that's what's happened and she's gone to fetch the dog, slipped, gone into the water. Problrm with that theory is, the river doesn't look deep or fast enough to carry her body away? Maybe she had headphones in so she left the phone to save it getting wet whilst she got the dog?
I know people keep focusing on the dog being dry - my dog dries fairly quickly. Especially if it's windy and he's running around. Dog could potentially have gone in the water closer to 9 am and then had 35 mins of running around, possibly distressed, until she was found.
I think the idea of her going missing herself seems unlikely. I know people can do unusual things when acutely distressed, but there has been no indication that she had any mental health issues, seems odd she would have let the family pet off, connected to a teams call and just walked off half way through? If that was the case, she would surely have had to use a credit or debit card by now?
Things that I'd be interested to know are:
Did she usually let the dog off it's harness or did it have a habit of slipping it
Did she usually listen to her calls on headphones and if so where are they
How can they be certain there are no slip marks into the water - it looks to be a big steep river bank - I'm not convinced they can rule that out?
There are reports that the first dog walker found the dog and tied it up but the second dog walker found it running loose again - was that because it had slipped the harness again? Are those reports accurate?
I pray for a happy ending to this case for the family. Failing that, I pray that they get answers and closure.