Expander presents a very detailed picture of the problem !
Actually, it's correct the ST126 and ST137 should score one or 2 "points" for "lightwind freeride" when considered that way..
"Mid wind" (or similar) catergory would help resolve that.
The chart is (was) a very macro level (covering "beginner" level thru to "extreme wave" in just a few lines..), so the intention was more general intro/explanation rather than the more specific selection detail contained on the individual pages etc..
But yeah, point(s) well made !
Cheers ~ ian