Normals throw normals... morphs throw morphs.
Rarely do you see normals males being used for breeding.
If you start considering breeding for genetics, then chances are that sweet male of yours will never see the inside of a female's enclosure b/w October and April (AKA ever).
You never know though, post a few pics, as he may have that certain je-ne-sais-quoi! Lots of super sharp critical eyes on this forum.
Also keep in mind that snakes that are heterozygous for recessive traits are phenotypically normals.
Snakes are line-bred all the time, if they weren't we would not have the amazing diversity we do in captivity. They are also non-migratory, so this would occur in the wild as well.
Most often dad is bred back to the daughters to find out if certain traits are indeed genetic. That is the easiest route... as dad can breed lots of daughters, but mom can breed only one son.
And if he is a granite... then he isn't a normal.
Not sure that helped?
Bruce