What's with that X half way up the switchbacks (not the one below the moraine)? Is there actually a spot to camp there somewhere?
Yep, big enough for 3 - 4 people, if they don't use a tent, and usually flowing water nearby. Actually, although I didn't mark them, there are several nice but small sites a hundred or so feet above switchback #23 (where the spring emerges). And when that spring is flowing, there is a fine stream trickle right next to those sites.
Damn, I just gave away another secret.
(The one by the moraine is best in winter when there is snow. It's in a depression, so protected. And, being several hundred feet above Trail Camp, is a better starting point in the morning. But it's rocky when the snow has melted.)