Or between the French and the Walloons. Surprise, our article on French people clearly labels the Walloon as a distinct ethnic group... Perhaps it is best not to make comparisons?   

After screwing it up a few times, I have done rewrites of parts of the article (mainly a word and a sentence left and right) to make the distinction and relation between the Dutch and the Flemish clearer. The article switched constantly between parts about the Dutch only, and parts about the Dutch and Flemish together. This should now be clearer. The major thing left to adjust are the graphs of the number of Dutch, since these still al include the Flemish.