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snorvich has it exactly right - mixing wrasses is a complex thing. Sometimes the exact same species added in the same mix won't work simply because the tanks are different size. Some species tolerate same species as long as not same sex.
Maybe a chart listing degree of aggressiveness would be easier? Then again, still a lot of variables. Mixing wrasses is a very doable thing, but more art than science. You kind of pick up a "feel" for it after trying different combinations, but even then it's still up to the individual wrasse.
This is just one of those things that is not black and white most of the time just a lot of grey.
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