that's not necessarily late its on time for most, Sex Links usually start early, and it's not always "good for them" can cause more reproductive issues. I still have one of four that is just now starting to mature(comb and wattles reddening getting bigger,squatting etc) her sisters are laying beautiful eggs for a few weeks now but, I'm sure shell catch up, mine are 23 weeks old yesterday. Might want to hold off on ther swap, getting more strangers could upset everyone and cause other issues coming into winter now? just a thought, sometimes swaps can be where people unload their problem birds? I paranoid to take the risk of introducing a disease to my girls, and stress from adding and a germ could be risky!!