Jester is a white factored tri factored sable merle. His mother is a color headed white. His dad is a tri.
So if I were to breed him to a another tri factored female there is 25% chance the pair would produce tri dogs...for that matter if they were a bi factored sable the results would be the same since bi color is recessive.
If he were bred to a black whether tri or bi the results would be about 50% whether they were a sable or tri. The only difference would be the pups and whether they would be tri factored tri tri.....or bi factored sables and tris depending on the female.
The white factoring.....I honestly know little about. I would assume if the pair were both white factored could end up with color headed whites. Most of this stuff has to do with breeding though. If one isn't going to breed them no biggie.
The merle pattern is not always as obvious on a sable because of the variations that a sable coat can be. Sometimes the base coat color and the merled patches as they age are very similar in color.
Jester
https://thegreatoutdoors42.shutterfly.com/pictures/11805
He is the sable merle there as you can see his mottled look is visible and at the time he was a year and a half old or there about. I do not have the more recent things that really show his coat off on the internet yet.