I did the 5 rows cutting the strands. Looking at the 20 row part I could cut it down to about 5 bobbins/ends but then I figured I could also knit back and forth and seam that small section and have nothing to weave in except the seam yarn.
Ahh yes, 5 rows = 10 strands. My head was all mathed out trying to figure in all the increases done in 5 rows to get the underside ribbing to match the neck, come out 2x2 and fit in the color work.
It’s interesting, I’m not sure if I would want to do a human size sweater like this.