I'm not sure when it changed, but in the end it doesn't make much difference, because no matter how you count 3 count hustle, you are not on a consistent downbeat. When in closed position I would feel more comfortable counting +1,2,3,{starting with the coaster step or rock}. But if I started with a two hand hold {like I might with 4 count hustle} I would be more apt to start 1,2,+3. {forward back and step}
Hope this helps.