I think Master od Flame is a great supporting Spec, and i rerely see any CWs with it. In my guild we always run CN with at least one, a thaum with perfect terror. He and some people of the guild even 3-men draco in different compositions, so thats how complementary CW builds can be, fast killing, controll, debuffing... Check these videos:
https://www.youtube.com/watch?v=_zOKxvwN_x0 (3CWs draco)
https://www.youtube.com/watch?v=b3iyfuTNdtY (2CWs & 1 GWF draco)