SC, will make a few suggestions for moving forward with breeding the BC Marans.
Do not settle for anything in a Male except one with good Dark Copper Hackle and Saddle. The Mahogany colored Hackle and Saddle will work just fine also. I prefer the Mahogany Male for my breeding pens.
The Males with the Wheaten Halo should never be used since it will only produce more junk to cull out later on. Do not use the White leg Males as that is a Wheaten influence also.
The wry Tail should never be used in a Marans breeding program, same goes for the Squirrel Tail.
Stay away from the Split wing, and weak wing. Never breed the Sprig or Coronation comb if you are interested in the SOP.
If you are breeding Dark females it is ok to breed a male with a little Copper on the breast , The males with Copper on breast will produce more female with Copper Hackles.