There does seem to be a bit of thought put into the 1A sectionals. 31 is the region and friends, minus South Newton, 32 is Lafayette, White and Carroll County, with South Newton and Clinton Prairie as a +1. Sectional 33 seems to be centered around Kokomo, while sectional 34 is the Ft. Wayne, Wabash, Wells, Adams County sectional.
I do find it interesting that Pioneer and Caston were kept together, yet the Clinton's were separated. Poor South Newton seems to be on an island, while Pioneer, Caston, and the Clinton's seem to be on the far edges of too many sectionals.
In the past decade, Pioneer has been in every 1A North sectional but sectional 34.