Henadic Theologian
Legend
Thri-Kreen were in FR before Dark Sun ever existed. They're a first edition critter. I don't even recall them being a thing in Spelljammer and I loved old school Spelljammer.
Did not know that Thrikeen were first edition, but I don't think Thrikreen were mentioned in FR until later, but I could be wrong.
My general point still stands.
Most of Eberrons races gave been legal options in organized play in FR at some point or other.