Basically exchanging better thermos aloft for better thermos toward the surface. The hodograph structure and synoptics are eerily similar.
Watch the storm near Stonefort, IL as it progresses southeast.
Been watching it for almost an hour, every time it looks like it's about to take on supercell characteristics it bows out again. I think it's stuck north of the front.
Perhaps one of those "popcorn" discrete cells down by HPX could take off and become a dominant supercell (as hinted at by some prior HRRR runs), but they too are taking their time getting organized.