I dunno, if I were Disneyland Resort, I'd be pretty happy with a 22.6% gain at the second gate with only a 1.1% decrease at the main gate. That's a huge increase with very little cannibalization. And the growth occurred in mostly the second half of the year, since the first 5.5 months of the year, DCA was still torn up (remember the temporary entrance behind Soarin'?).
I also see it as significant because it shows that while small additions in DCA (World of Color, TSMM, Mermaid) moved the needle a tad, big budget tent-pole expansion is what it took to see significant growth. Disney should see that and realize that's the right course of action to take at WDW, too, if they want similar results.
Also significant is that Disneyland Resort doesn't feel significantly more crowded than it did before Cars Land opened. The back corner is packed near RSR, but the parks have done a great job of absorbing the crowds. Even over Memorial Day, the parks were fine...