Don't mess with Michael Adams! He's beaten all the Worlds elite in his time, not the kind of player you're going to catch out with a questionable opening. What's more, the chances Michael hasn't seen this opening considering Tony Miles has played it is very slim! Adams would have prepared for Miles a few times considering they've met for the British championships before.
Carlsen is usually so sound out of the opening, what's he playing at?? I can understand him wanting to avoid using his best weapons in an Olympiad with the Candidates tournament coming up (I feel for his opponents in their preparation, i think Carlsen must be a nightmare to prepare for, given he rarely seems to play anything twice!) but he could have simply prepared something like the pirc, or a Hedgehog defence for this tournament and reverted to his more favoured Nimzo when the Candidates starts...? They might not be considered the 'best' defences but with his class you'd expect him to play them perfectly. This sort of line is frankly beneath him.