Thank you for the link. Yes, the rib/roll gets overlapped and sewn down to those center 14sts. It's not very clearly shown in the picture but that's the idea.
I did have a giggle over the directions:
"Sew rib/roll Front at center neck, overlapping center fronts (left over right for male; right over left for female
Who knew there was a way to overlap the edges that was gender specific? Very sweet pattern, btw.