First of all, unless you have easy access to supplementary breeders from another source, it is always best to keep at least two roosters for each variety. It is not difficult to construct small pens to keep extra males in. That said,
there should be no problem with breeding uncles to nieces unless the line is already extremely inbred. You will notice that happening when egg production, fertility, and/or hatchability suffer. If the gold edging is only a little in the saddle area I would not worry too much about it. But I would not breed him back to his own daughters, as that would probably fix an undesireable trait in this line. Select well colored male offspring to breed back to this generation of hens. Two or three breeding pens for each variety, along with good records, will help prevent too close inbreeding. Good luck!