Or how Voyager frequently had episodes where Harry Kim got screwed over.
One thing that bothered me with TJ was that she was the only one in the main cast who never used the stones on screen. Hell, most of the secondary characters were seen using the stones at some point. I could accept the "they never got a chance to tell that story" line if it weren't for the fact that they made Greer never using the stones into the plot of an episode, even though we'd never seen TJ use them either. Hell, all they really needed to was just show her removing a stone from the device showing that she just returned from a stone swap and I would have been satisfied.