Forget for a moment Friday's outcome - let's go back a bit....
When they were voting to give someone a pass to the final, Dexter said he voted for Sophie as he though the rest would too and that he wanted Sophie/ thought she should be in the final. In that case, should he not have picked Gina to replace him? Thus ensuring that Sophie got to the final. Or was he no longer that sure of Gina's position with the GBP, but felt that Sophie was safe?