Excellent report! Very interesting data.
The Dominiques don't surprise me in the slightest. They're a small breed to begin with, and hatcheries usually produce smaller birds than breeders.
Interesting on the Buffs, too. The breeder ones I had were not meaty at all around 16 weeks ish when I butchered a few, but I have reservations about that breeder overall, so that probably had a lot to do with it.
There are SO MANY roosters listed in my FB groups lately. Honestly, if one had the time and inclination, around here I could really fill my freezer for the cost of fuel and my time processing.