Zigzag and I were the last of our group to leave the campsite.
One of the CDT's distinguishing features is a series of alternate routes that hikers can choose instead of the main route. The alternates became a tradition of the trail when the CDT was first developed. Though it's nearing completion now, most hikers still take one or more alternates on their hike.
It's generally frowned upon to take an alternate route on most long trails, with a few exceptions like at Crater Lake on the PCT.
The CDT has so many alternates and they are so acceptable that it's unlikely one hiker will walk exactly the same distance as the next. Some alternates are actually preferred over the marked or "official" route. The Gila River is one such alternate, and Zigzag and I have already decided we will take that route when we get there next week.
Some alternates are just used for convenience, to shave a few miles, or to pass closer to a town. Right from the start today, Zigzag and I took an alternate like that. So did most of the hikers we camped with last night.