A head count sport means they have a certain number of scholarships, rather than a pool of money. So it can't be divided into partial scholarships in order to have more athletes.
Correct. D1 W-Gym has a headcount of 12. If they give a girl even $1, she counts as one of the 12, same as a girl who gets a full-ride. D2 W-Gym is equivalency (I think 6), so they can spread out the money that would cover 6 girls amongst more girls, and the amounts don't have to be equal.