We have four 5 week old light brahmas that supposedly hatched at the same time and they are all over the place!
One looks weeks ahead and is fully feathered, has great feet feathering and is fluffy and round, the second one is almost feathered out, not as good on the feet, a bit smaller but a puffball, the last two look crazy! Just getting feathers in, backs are still fuzzy\bare with no feathers, tall seeming with long necks (not roos), but just really slow to fill out. I was starting to worry but they are showing progress.
We also have two buff orps and one is fuller, lighter in color, and has more developed comb (still don't think it's a roo).
Having 4 of the brahmas definitely showcased how different they can develop and look.
Hope it's not a roo for ya!
**My daughter picked out the biggest "puffballs" and those are the two that are the fullest looking