The main problem with the anthologies is consistency. In one story, Nightfall is an infant younger then Cutter and Foxfur is a full-fledged warrior, in another Nightfall and Foxfur are 6 when Bearclaw and Joyleaf Recognize. The anthologies play around too much with established ages to be considered canon.
And sometimes a kid doesn't inherit pure coloring. Skywise's hair was silver-white and he inherited the grey coloring from Shale yet Shale's hair is more of a middle grey coloring. Same with One-Eye and Scouter both have chestnut hair, yet One-Eye's hair is lighter then Scouter's. Cutter was a blonde like Joyleaf but while her hair was golden, his is more like pampas grass in coloring. In other words the kids might inherit some of their parents coloring but probably not the exact shade,tint or hue.