For me the main issues are he was supposed to have dinner with her for Thanksgiving, she obviously never showed up and he didn't alert anyone? This responsible young mother who apparently never leaves without notice, his fiancé and the mother of his baby and he's not concerned enough to notify police or even family?
Second issue, he's not allowing grandma to visit the baby.
Those things plus he was the last person we know of to see her alive when they exchanged the child and there's no proof she was alive after that, pretty big target on the guy.
Well regarding Thanksgiving, my sense, and this is jmo, is that they had dinner plans together for Thanksgiving (or at least Kelsey thought they did and told her mom they were going out to dinner). The next thing we know, PF has the daughter with him, and LE is talking about the last time PF saw Kelsey, it was a "custody exchange." So my guess is he probably told his family that Kelsey was no longer coming to dinner, he picked up the kid, and she was doing x instead.
I don't think it was ever presented as she didn't show up for dinner. Again, jmo, but it seems like dinner plans got nixed and he took the child into his care instead.
All of this is likely irrelevant considering we don't know what happened during that child exchange and Kelsey hasn't been seen since, and all the logical questions of why.
I just think in terms of "why" no one immediately alerted police that she was "missing" - it was never presented as she didn't show for dinner. He had picked up the child earlier in the day - and it seemed at that point, it was conveyed that they had separate plans for the evening. All IMO!!!
It will be interesting to see what their texts from that day said if they are recovered. And what the text from her phone said to him on November 25.
And yes, he was the last person reported to see her.