big stupid is the wrong name for the trail, it's actually skull or upper skull as a lot of people say seeing as the trail is split by the BP. trailforks has the name wrong for some reason.
The trail was renamed Big Stupid when Digger redid that section of trail, coinciding with the DNV's signage project in 2011. It makes sense to me because this section of trail doesn't actually end at the top of (Lower) Skull. While it was often called Upper Skull by locals, was the trail actually on a map with that name? Asking because I simply can't recall.