I guess the colored coneflowers must be hybrids that have ordinary purple coneflowers as a parent and so the seeds don't come true. I have given up on the colored coneflowers here (at least for now). I've tried several and I've coddled them along and I get one year and no returns (except for a dark pink that's almost purple and hardly worth it...). I grow zinnias instead....much better color range, similar shape/size and more flowers. Annuals, but not hard to grow here from seed.
And hey, seed starting is like eating cashews..."just one more...just one more...."