David, great write up on Ellerstina, here and on Top 100. Nice to see Matt Dusenberry being recognized on GCA. He is certainly one of the most interesting young architects out there with several fantastic designs and restorations to his name.
I wanted to emphasize how good the design is. If The Loop is actually 2 very good courses and they rightfully get acknowledged as separate courses, Ellerstina can be viewed like this as well. There are at least 72 full holes identified without repeating tees or greens, including two 18 hole courses formally routed, with tees just a few yards away from each previous green. The 2 18 holes routings are above 7000 yards with full par 5s, long and short par 4s, and par 3s of varied lengths.
In addition, the Pieres family has come up with a separate 18 hole routing that plays to their liking, which I think is not as good as the original routings, but still spectacular except for 1 hole where they came up with an internal OB for difficulty sake. Bear in mind these guys can drive it as long as PGA Tour players.
The massive double greens, many in the 14,000 to 16,000 square feet range, and up to 230 long, often feel like 3-4 different greens with 10-12 completely different pin positions. Bunkers also play completely different depending on where the flag is, with angles that change more than 90 degrees.
Of course this design has 2 restrictions: 1. No more than 2 groups can play at the same time and 2. fairway height of cut throughout the playing area.