Lyman:
Here's some information for you>
The distance to this junction from Siyeh Bend is 1.2 miles... and about 1.4 miles from Jackson Overlook.
The big difference is that there is about 1000ft of elevation gain from Jackson Overlook to the trail junction.
The gain from Siyeh bend is about 400ft. So if doing day hikes to either pass, it be "silly"?
in my opinion to start at Jackson Overlook.
The trail between this junction and Jackson Overlook is for the backpackers; It makes a link to the Continental Divide Trail(via the trail junction at REY) as well as the Gunsight Pass trail.
pete