Lately I've been noticing that this rooster's breast/chest seems to be sticking out abnormally. He certainly doesn't match my other EE rooster. This rooster is an easter egger and not the dominant rooster. He is about 21 weeks old.
The crop is almost always on the left. The bulge in his chest, if it's the crop, should be on the left, and sort of soft, malleable; you can usually feel the grains etc within the crop from touching it on the outside. If he's not losing the cropful overnight then he possibly has a tumor or blockage.
What I laughed at was not his chest protrusion, which could be normal for a crop that's full, but rather I laughed at his 'depth' from back to belly when compared with his head. He's massive. The beard kinda makes the image worse. I've only seen that body shape on Cornish X's prior to this.
There's a possibility, however slim it may (or may not) be, that he's intersexed, male on one side and female on the other, a gynandromorph.
Can you get a photo of him from each side? Do you notice any differences between his right and left side asides from the breast muscle difference?
Here's some info on that. Apparently it's not too uncommon for hatchery birds and the main reason they were initially spotted is due to breast size differences, larger on the male half and smaller on the female half. Both the following links deal with the same article, just one has a bit more info.