The section you ask about is in fact rewoven! I didn't like the way the pulled threads worked, so I cut out the entire area and used a very fine embroidery thread to stitch around and across the open area, and liked it better. This little section had a lot of experimenting!
Lydia, thank you for making time to comment on my work. I like the way you experiment with your stitches and fibres. I am now trying to explore sumptuous embroidery on my own and after completing the piece will make it into a cell-phone pouch. That T-shirt that you embroidered is a very neat idea.