I left the 4 new stitches on my stitch holder...not sure if I needed to include those in my next round. I believe I tried to stitch into them (placing them on my left-hand needle), but they were waaay too tight, so I put them back on the stitch holder (essentially, my right-hand needle at the time).
I definitely see what you mean about loose stitches in the next few rounds, but they have tightened up nicely.
Just not sure I should have left those new stitches on the stitch marker with my 9 thumb stitches...then again, they were awfully tight to stitch into (could be my thin stitch holder).
Thanks so much!