lets just make believe that the yellow color was a trait...
if hunting traits were a color all dogs would be that color and all would hunt...if it were the yellow color the variation would be from light yellow to dark yellow as to how much hunt a dog had...if darker yellow meant the best hunting trait then all dogs would be dark yellow...that explains a lot about the yeller dogs...

JK, JK YBM...

so breeding better hunting dogs would be easy (unless you are color blind

) because it is visual and no breeding and hunting experience would be needed...
Well I had a very good kemmer gyp and I bred her to a yellow dog of a different breed and all 10 or 11 pups came out different shades of yellow brindle... I called Robert Kemmer who was the man behind the creation of the Kemmer mtn cur and he said anytime a kemmer was bred to another breed of yellow dogs the pups would come out brindle...and he said the same would happen when the kemmer was bred to another yellow mtn cur of a different strain...but there is a reason for this...a possibility is that some yellow dogs are genetically yellow brindle even though they appear to be yellow...but the brindling is faded out to match the yellow color in yellow dogs...so once the dog is outcrossed the brindle shows up in the pups...I read that a long time ago and that is how I understood it...but I was confused by the time I finished reading that...

so not saying it is right but something to think about...
So to me it is very possible that hunting traits can and will play the same type of tricks...that is probably one reason we have so many culls out there...