My thoughts on the identity of the Governor: The Governor has used his/her ability to save only Gin Ichimaru, but as we have learned, Gin Ichimaru wasn't the Governor himself. Therefore, the person who saved Gin Ichimaru is unlikely to be a person who voted for him. Yoruichi and Shinji Hirako are inverted on this: they were not saved, so it is likely that the Governor thought them guilty and so would have also voted for them.

As far as I am aware, only Captain Hitsugaya can fit my theory.