Apple math : A6x = 2*A6 ___ A7 = 2*A6 (~A7 = A6x)_____ A7 = 2*A6x ??

Apple settle for the A7 on the new 9.7" iPad (Air) to reduce size and weight , but either i'm missing something or they are worse at math than a 10y old ..

The A6x had 2x the GPU power of the A6 , and at the iphone 5s presentation the claimed the A7 had 2x the GPU of the A6 (putting it at A6x level) . And benchs do put the A7 at the A6x level ..

But now they claim that the A7 has 2x the power of the A6x ?