Geez, I got to start paying attention to these things!
About the Blue Flame, when I was checking out if the Controllers had a home base, I pulled out the Legion Archive to reread Adventure Comics #357 (Ju'67) "The Ghost of Ferro Lad!" which was the first appearance of a Controller. It was he who unleashed the Sun-Eater and wanted the Legion disbanded. On Page 19, Panel 2, he creates a manifestation of his power which does resemble blue flame. He also possessed vast mental abilities, uber-technology and the custom of manipulating people. True he died in that story but does that matter today? Plus the Controllers were revealed to be an offshot of the Guardians of Oa. The Darkstars were their agents.
I don't know if that has anything to do with Levitz's story, but I thought it interesting.