Yeah, sorry, missed the axle on that fulcrum wheelset. What you want is a 135mm qr in the rear.
The original wheel died due to fatigue stress at the rim, possibly by excessive tension on that spoke. Doesn't really matter, needs replacement. Someone might have overtensioned to cover for a short spoke but the wheel robots don't care and I think it's not that likely. If the short spoke was a problem in of itself it would cause nipple failure.