I don't think there is a pattern in people's polarities from incarnation from incarnation.

JMG was a heterosexual female in the last incarnation which I assume means the usual astral feminine polarity and then in this incarnation was a heterosexual male in this incarnation which I assume means the usual astral masculine polarity. Then you have our OP Kimberly Steele who is heterosexual female today which I assume means astral feminine polarity, but says that she will be a gay man in a future incarnation, which I also assume means astral feminine polarity.

But I'm just inferring people's astral gender from their sexual orientation, which might not be correct in all instances.