This pic is with dimmed light in a position that accentuates his arms. Here is a pic of him, again in 2012 from a somewhat similar stance, the difference is incredible compared to the pic, despite the normal lightning:That top pic is actually from like 2009.
Here is a pic of him from 2011
He is bigger now but not as much as your post implied.
And other one:
And this is "undashing" Cody Rhodes with his mask:
Here vs Mysterio in their feud last year:
Those are just randomly browsed pics and the difference is enormous no matter how you look at it unless you're using pics of him flexing or dark lights from 2011 and comparing them to him unflexed and with normal lightning in 2012. He's been riding the bicycle hard in the last 9 months or so.