Yes, the 9 sts between markers are what you put on a holder to work later. So k1, put the sts on hold, then cast on 1 to your working needle with the yarn, you can just do a backwards loop around the needle with the yarn, then you go on to knit the rest of the hand stitches. The CO 1 st bridges the gap a little where the thumb hole is and becomes part of the hand stitches. When you go back to do the thumb, knit the 9 sts, pick up/m1 in the gap between them and the hand, all around the thumbhole. So you should end up with 13 sts, but picking up the extra stitches helps prevent small holes where you join the hand with the thumb.
sue- knitting heretic