You may be right, but there are a ton of variables that could impact where the new school ends up even if enrollment ends up mid-600s.
Seems like at that size, under current system, it would come down to extra factors (see East Surry in 2A at 588 but Eastern Randolph 1A at 671). And the picture is still really vague there. Does the NCHSAA keep the same factors outside of ADM? Do they go back to just ADM? Do they add new ones? How do the three current schools perform the next few years and how do they come up with the Cup score for a consolidated school?
Plus there are some things that could otherwise impact where the line is. How many new charters open and take up spots in 1A? How many more students do traditional schools on the border lines lose to charters as they keep growing? Do they keep classifying East and West separately? If they stop that, it should move the line down a little for schools in the west. Do we finally get a 5th (or 6th) class? I definitely think the new school will be smaller than the sum of its current parts, but I’m just in wait and see mode on what class it will be.