I cannot find a clip with RT mentioning Las Vegas. What I find is that the Inside Edition piece says (in "reporter" voice): "...husband believes she may be in Vegas..."
I want to know if the original reporter asked "Where do you think she is?" and if RT said, "She could be anywhere - Vegas, out in the desert, I don't know." Or he said, "Well if she got into someone's car, she might be in Vegas." Or...something else. "If she was abducted, maybe they took her to Vegas."
It would be normal for a man his age to think about a woman "being taken to Vegas" because there was a news story in the region, maybe 10 years ago, where it was believed this happened. Later, the woman turned up alive in Henderson (where RT lived at the time IIRC) BUT...she was never abducted. She left the man she was with, got voluntarily into a car, and partied in Vegas (and then asked to be dropped off near Henderson).
Was RT trying to paint Barbara as an aging party girl who might have gone to Vegas (being, perhaps, a bit miffed at him - like the woman in the above story)?
But I can't find any video of him mentioning Vegas, unfortunately. I think it came to the mind of the original reporter (and it came to my mind right away too, I live not too far away).
Anyway, when I heard "RT said she might have gone to Vegas," I wondered if they'd had a fight (plus the woman at the kennel saying Barbara was uncharacteristically abrupt or non-cheerful, something like that).