Having a thread about him on letsrun might add a tiny bit of pressure, but not a lot in the grand scheme of things.
I doubt he reads these boards. I certainly hope he doesn't!
Besides, somebody has to be the best. If HE wasn't so fast, the pressure would simply move to another kid. In a perfect world, there would be no pressure on him. But pressure comes with the territory when you are that good.
I know nothing about Dolan Owens. For all I know running is just something he is good at. Hopefully he is also playing soccer, baseball, etc... like lots of other seventh graders and excelling at those sports too. Hell, I HAVE a seventh grader and I don't know a single one who only runs track.
Hopefully Dolan will keep his mileage low, do his best, and have fun until he decides if he wants to run in high school/college.