It was only secret for a while. That time has passed.
Meanwhile, why is it Jim Lee is choosing better costumes then the ones used these days?
Cause he's awesome!
I don't believe it was ever exposed to the public that Sensor Girl was really Jeckie. She certainly didn't ditch the mask once she revealed herself to the team. Maybe it happened in the time that " DC really doesn't give a $#!T" about explaining to fans what the f
k happened between LSH #63 and the fake "REAL" Legion's return. That would sure be more interesting that the $#!t they've been writing lately.