I think cropping the full frame would still look same or better. A 300 f/2.8 on a 1DX beats same lens on 7D. Are you stating that the crop would out resolve it in terms of actually visible image quality? Not just theoretical numbers?
Have you tested this using both cameras? Not being argumentative just wondering how you know this?
It does; they are; they haven't; and they don't.
Not only does the 1DX cropped beat the 7D, but the 5DIII cropped beats the 7D, and the 1DX beats the 5DIII.
Any time anybody starts mouthing megapickle measurebator myths, it's safe to assume they've never actually done any meaningful photography with the gear in question.
I just like how after the 1dx-d7100 comparison img by ankorwatt which -understandably- you failed to address, since facts doesnt quite match up your beliefs, you downscaled abit now, comparing 1dx with 7d's zombie sensor, oh well...