That would indicated 11 unique imported birds in total in the gene pool, to break it down into an easier to read format...
3 import birds (1 roo, 2 hens) used to create the A line
1 import bird (1 roo) used to create the B line using A line offspring hens ***
3 import birds (1 roo, 2 hens) used to create the C line
4 import birds (2 roos, 2 hens) used to create the Rees line
***What is unclear is how many A line offspring hens were mated to the unique B line roo to create the B line...
If I remember correctly wasn't it between the B & C line the Gold started showing up? I actually like the picture of the B line rooster.