It's probably wise to keep those bloodlines separate -- just like keeping the Chocolate Labs out of your Yellow Lab bloodlines because of the risk of coming up with a "Dudley" (a Chocolate Lab with the dilute coat color gene that produces a Yellow Lab from a Black Lab. A "Dudley" is a Chocolate Lab with a yellow coat -- they have pink eye rims and a pink nose. Not a good thing for anybody, they're supposed to be more susceptible to sunburn and skin cancer, and disqualifying in the show ring).
Genetics be it kitties or doggies is fascinating. I have two white sable dogs and 1 silver sable dog. It’s amazing what you can come up with. They all have the same father who is a pure white. The girls mother is a white sable and the boy’s mother is a light gray sable. The father and mother of the girls produced an entire white sable litter which is the only one ever produced in this breed with a white father and white sable mother. They said it couldn’t be done. I think it was because the father had a lot of whites in his background and the mother had a lot of whites in her background. Probably a double recessive white gene there.
However, the father and the gray sable produced a litter of no whites and 4 silver sables.
Genetics is so cool; and you can predict what the pups might be; but then you get that occasional odd one that’s been hiding. LOL like the chocolate in your blue’s history.
So, it’s kind of a crap shoot.