I think just the Dres are Ordinators, but the Buoyant Armigers seem diverse.
Actually from the title I was assuming it would have something to do with Chaucer's Knights's Tale from the Canterbury Tales.
Actually, it's the Indoril, not the Dres.
Indoril favor the Ordinators, while Redoran favor the Armigers... but neither is exclusive.
Check the UESPwiki under the Morrowind articles for Ordinators, and the Imperial library has a pretty decent article on Houses Indoril and Dres, if you use the search function.
http://www.uesp.net/wiki/Morrowind:Tribunal_Temple
http://www.uesp.net/wiki/Morrowind:Ordinator
http://www.uesp.net/wiki/Morrowind:Buoyant_Armiger
http://www.imperial-library.info/fsg/lordhlaaluarticle1.shtml
EDIT: But this is getting off-topic. Zalphon, maybe you should ask this thread be closed.