Brian did ask the MIL her SIL's name and she blurted out her SIL's full name. She kind of said the last name quickly and (from the clips I saw), Brian did not actually ask how do you spell that. I think if she had just said the first name, he may not have asked for a last name. In the interview with the guy himself, Brian said he just wants to go by his first name. MIL was flustered and rambling. I thought he was actually pretty respectful toward her. I think he's pretty earnest and does a nice job of coverage.
I felt bad for the family. The adrenaline and shock and fear. I think they spoke freely because they had nothing to hide. They looked like people feeling like is this for real?? Seriously?? Rather than smooth or coy. What a mess.
And I get why someone called in a tip. The guy's basic eye spacing, lips, mustache fall into the ok, hmmm. Then add in what I think was a white vehicle and he does deliveries in Tucson, and yeah, someone likely called in exactly the kind of tip LE wants to hear. It was just a mess from there. Also, the guy clearly having no idea, immediately offers up something like, "I don't know her but I may have delivered something to her." Which on its face sounds like wait what, whoa. But sounds more like him trying to figure out how who the hell this lady was and why they were asking him.
I think he was in stunned shock, adrenaline, and that it was all surreal. One minute you're doing a door dash delivery, the next you have the FBI pulling you over for one of the biggest kidnapping cases in decades and reporters putting microphones in your faces.
I hope they pay for the freaking door to be fixed. But if he was the bad guy, we would have all been glad they barged on in. Tough night.