Well, first of all, if you are looking to breed to the Standard, yellow legs are to be thrown out. Not only is it a disqualification, it is also a recessive gene which means that even if the bird appears to have white shanks (which is what the Standard calls for in Black Breasted Red) it can...
Yes.
If you need some guidance on what colors you have, would you like to post some pictures of the birds in question?
Identifying chick colors is not my strong suit, though. Chicks can be deceptive, and yoh never really know what you have colorwise until they grow up! (Unless you have a...