John,
Yep, I saw that photo when looking for lines other than the first ascent. If the summit register is to be believed, the Plumb Line Buttress is probably the, in my flea-bitten opinion, less aesthetic buttress starting from the right edge of the leftmost snow patch. We initially had our sights on the thinner rib west of our central buttress but there appeared to be a section of rot where it first gets steep and another below the top so we opted for the safer option.
It's anyone's guess where Roger Jung went but I wouldn't be surprised if he climbed roughly the same line as us. I would call ours a "possible" rather than "probable" first ascent.
To add to Eric's list of stats: We took about 6 hours on the route but that's 'cause one of us is "old and in the way".