Actually this is also when they found out the Keplers were boosting which wasn't released in the original Benchmarks. The 680 was barely hanging on most of the time. And don't forget the 680 was completely compute gimped. The 7970 was the definitive king till the Titan, hands down.
Boosting was mentioned that in the review. It was pretty well known, it was a main feature since Fermi GPU boost 1.0, 2.0, they were card features, nothing hidden there.
The 680 gtx wasn't made for compute it was made for gaming, there was and is no need for DP performance in gaming cards. The 7970 was AMD's first attempt to make a gaming/compute card that worked well all round, which they succeeded, but ran into the same issues as Fermi, too much silicon and burned too much energy.