ThatObviousUser
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If I recall correctly, Batgirl was the only Bat character that was having some kind of tv rights issues. They said No to Plastic man, Classic JLA, Power Girl, possibly others, but those are the only ones I recall off the top of my head.
I never got it either. Rights issues are one thing, but why deny characters to a guy who has proven he knows what he's doing?
Didn't Power Girl show up in JLU? She was a clone of Super Girl or something.