It always amazes when we talk about Heritige RIR that leg color always gets the most responses from people who are not regular posters to this thread. Not body type, feather color or quality, but leg color.
I have found that leg color is effected by numerous factors that are not genitic.
Food, how long they have been in lay, age, weather, ect.
This is true for all my breeds no matter what color their legs are.
I have a 10 month old cockerel that until he was around 7 months old had really yellow legs with dark red lines. His legs now are light yellow but the lacing is still present. He also has almost black spurs growing in.
Legs color has been hotly debated on this thread before.
Bob and other master breeders will agree that it is just a piece of the puzzle and over all type is what you should shoot for.
Billy it would be nice to have a bird that had deep yellow legs and had everything else that is true to type. However I believe that two RIR judged side by side would have to be equally superior in all aspects before leg color (deep verses lighter) came into play.