Does every David Henesy grow up to become Louis Edmonds?
If I remember correctly, Daniel is the only case where we see child David Henesy growing up into adult Louis Edmonds, so I don't think we can generalize from that. It is, on the other hand, interesting to see alternating generations of Louis Edmonds and David Henesy from 1897 to the 1960s - Edward/Edmonds, Jamison/Henesy, Roger/Edmonds, David/Henesy. It might have something to do with Edward and Roger both marrying Laura.
I'm not too thrilled with the Head. It's an awfully clunky plot device at the moment. In other timelines, bad things came to the Collinses because of their own knavishness and/or foolishness. In 1840, Desmond just happens to bring a Head home with him. Clumsy. And how did the Head make it to the far East, where Desmond found it, after its adventures in Bedford?
I'm still bothered by Daniel's sad fate, and also by the fact that it's only a partial answer to the problem of how to explain away the fact that nobody pulled a Grandmamama in 1840 and said to Barnabas, "You're the Secret!" There's got to be a better way.
Oh, dear me, I always knew I didn't much like 1840, but it's only just now that I'm starting to think about it that I'm getting a pretty clear idea as to why.