In #1, I wasn’t talking about any particular time, I was talking about total numbers. IIRC, slightly more boys are born than girls. By marriageable age, there are more girls than boys (more boys die during childhood).
My #4 was aimed at Joseph, who said non-Jews don’t have a bashert because their marriage is not a halachic marriage. They have a concept of marriage, and as yitzyk pointed out, the gemara doesn’t specify that only Jews have a bashert.