I've often wondered if Sela would have worked better if she actually was the alternate Yar herself - who had either been broken by the Romulans or willingly defected to their side.
What are your opinions on Sela? Like her, hate her, what and why?
It would have been interesting to see an aged Crosby/Yar interacting with the crew, much changed/grisled after years of imprisonment. Perhaps even bitter/vengeful against Picard and Co.-- leading to interesting character development and future storylines. She could've been both a Federation hero and have an agenda against the E-D
It also would have made for an interesting two-parter to have the E-D be sent on a mission to retrieve this old Federation POW and realize it was Yar....