I think the point is it's unlikely that there's a connection. It's a wilderness out there, there are lots of Mormons, and lots of little blonde boys. If it were all children with a common relative, or all of them disappeared on the same time of the same day of the week/month, or they were all named Henry, then yeah, but not all coincidences aren't connections. Sleuthing is also about the ongoing evaluation of one's theories/ideas based on additional information. I'm just trying to add additional information about the area which is that, IMO, those features are too common to be significant.
I guess the biggest non-connection for me would be the lack of evidence that all those cases are even thought to be results of foul play, right, unless I missed something?