Project II: Pelmatozoan relationships

Primary hypotheses to be tested are whether crinoids evolved within the Eleutherozoa or Pelmatozoa. Did (I) the pelmatozoan stalked condition evolve more than one time, or (II) do the crinoids, blastoids, and other pelmatozoans with similar columns form a monophyletic clade?

Further, what are the phylogenetic relationships among the various pelmatozoan groups?