My Cuckoo Marans have pink legs, & Hoover's sourced.The birds in this thread were purchased as BR? Or are we talking about another thread? I'm getting super confused! And it all depends on where they were bought as BR. I wouldn't trust TSC to label anything properly.
I got the jump start on the line of questioning from this site, actually. BYC is kind of like my wikipedia for chickens, haha. But Poultry Keeper lists BRs as one of their parent breeds along with several others. The stuff concerning hatcheries is probably mainly anecdotal; people have been getting CMs from hatcheries for years that lay lighter eggs and have yellow shanks. I'll keep digging though, to see if I can find more explicit sources.
Also, I posted pictures of CMs from both Hoover and Cackle with yellow legs, so that's part of it as well.