Is Godzilla shrinking in the movie? A Theory of mine.

So I noticed this a couple of trailers and tv spots back but now with the release of the "Nature has an order" tv spot and the wonder con leak I think I can put this out now without feeling too hasty on the subject. In the "It can't be stopped" tv spot and the wc footage for those of you lucky enough to have seen it before the internet police decided to reveal themselves to the our very own Spacegodzilla2 and forced him to purge the video from this website, you'll notice that Godzilla's spines are indeed rather large when compared to their appearance at the end of the "Nature" tv spot. The only other time we get to see his spine's that large was in the official main trailer when he was rising from the water and we decided to throw a nuke at the back of his face. If anyone can grab clips from those instances and post them here you are welcome to. Heck, maybe this has been argued before or maybe I'm looking at nothing. Maybe its just a mere design error that Legendary overlooked. What are you're thoughts on this? If Godzilla's spines are indeed shrinking is it a product of the Muto's doing or is something else at work here? If I'm wrong, well, it's all good talk either way. And as always, let's all keep this discussion civil :]