Liz Carmouche is a lesbian and with the UFC, so she was Jason Collins before Jason Collins was Jason Collins.
Not even close to the same situation. Plenty of female athletes that are out. Hell the #1 draft pick for the last WNBA draft is gay and out. There are millions more people that know who she is then Liz. No one that plays in a league that has the popularity of the NBA has ever come out, while active in the league.