There is a lot of noise in the Union Leader report about weather and limited visibility. It also says he fell into Snyder Brook, but not where on the Brook except that the rescuers walked him "down more than 2 miles to the trailhead" (which would be from just below the crossing of Watson Path at 2.4 mi). (Snyder Brook parallels Valley Way). The WMG doesn't mention any crossings of Valley Way, nor does the map show any, but certainly other nearby trails do cross or access the brook.
The report doesn't say what route he was taking down, but it does say that the rescuers headed up Valley Way. IIRC, Valley Way is the most popular route to Madison and certainly the best in bad conditions.
[speculation]
It has been a long while since I have hiked up that way, but navigation should not be difficult once one enters the trees if he was indeed taking Valley Way down. If so, I would not expect the limited visibility to have been an issue.
Quote from the article:
"His gear and his experience were up to snuff, but he was soloing and was goal-oriented and he didn't make the right decisions when the conditions deteriorated."
Huh? He fell into a brook. Last I knew, that was called an accident. (I guess that one is expected to be wearing cold-weather diving gear if there is a chance of falling into water.)
[/speculation]
The report leaves some important details out--hopefully other reports will supply them.
BTW, I was taught that if one falls in water, one should roll in the snow to "sponge" as much of the water out of one's clothing as possible. And change into dry clothing ASAP. Beating the ice off one's clothing may also help. (That extra gear discussed in "Insulated Pants-outerlayer"
http://www.vftt.org/forums/showthread.php?t=38519 might be helpful here...) This is one of the few instances where a fire can be useful. A helper or two might also be handy.
Doug