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Really? They're not using chainguides or anything? In 'cross that seems mental. All the DH peeps seem to run chainguides.
Not sure - big ring front but small at the back might allow the chain to get whippy, especially bouncing over potholes and stuff. But I've no experience with 1x11 so this is all just guessing.
hippy-
I've not raced on it yet, but have done 75 miles in pretty mucky off road conditions on a single ring (from Absolute Black, made in Poland) on an 11 speed 105 rear mech and cassette. It's a bit noisy in the bottom two gears, but so far I've been very impressed with how well it works.
I have no chain guard or guide fitted.
andyp
Plenty of people run narrow/wide chainrings in cyclocross without clutched rear mechs or front mech guides - and there is a much greater likelyhood of dropped chains off road.
Also bigger chainrings might(?) help reduce the chances of dropping a chain due to bigger wrap....
Also 127mm vs 130mm wide isn't a big difference in angle (even when you consider that the older blocks c-c max to min tooth distance would be slightly smaller as well)