So maybe the lacing of BBS Blues is NOT the same "type" of lacing as that in Black Laced Silvers. I wonder why Splash's don't show lacing. If the blues look laced because the dilution gene only works on the inner part of the feather rather than the "black lacing" being "applied" like it is in the Black Silver Laced? This would seem to be the case given
I know part of it, but not all of it.
There is a particular spot on one chicken chromosome, called the e-locus. There are quite a few different alleles (forms of the gene) that can be there, and they all have effects on how the black & gold are distributed over the chicken.
Laced chickens often have E^R (Birchen) or e^b (partridge) at the e-locus. Then they have a combination of Pg (pattern gene), Ml (Melanotic), and Co (Columbian), sometimes with Db (Darkbrown) as well. That combination of genes makes the black and gold form lacing, rather than some other pattern. Changing one or another of the genes can give you spangled birds, or double-laced birds, or birds with a Columbian pattern, or various other patterns that may not have names.
Black chickens are typically E (Extended Black) at the e-locus. With that e-locus gene, it doesn't matter whether they have Pg, Ml, Co, and/or Db. They just look black anyway.
Blue chickens are diluted black chickens.
I have seen speculation that blue chickens with Pg, Ml, Co, and/or Db may show nice lacing, and blue chickens without those other genes may not have nice lacing. If that is true, then the laced blues may have many of the genes needed for lacing (Pg, Ml, Co, and/or Db), which would matter in a few generations when you have birds that are not E (Extended Black.) Getting rid of the Extended Black will let you see what other genes you are working with.
So lacing on blues might be "the same" in requiring Pg, Ml, Co, and/or Db (I am not positive about this.) The part I am sure about: lacing on blues is different because it is on a base of E (Extended Black), while other kinds of laced chickens have E^R (Birchen) or e^b (Partridge).
(If you're interested in the e-locus, there are also E^Wh called Wheaten, and e+ called Wild type or Duckwing. The + indicates that it is the form found in the wild junglefowl. There are almost certainly more alleles at the e-locus, but they have not all been identified and/or studied. The names Birchen, Wheaten, Partridge, and Duckwing/Wild Type are what we call a chicken's color when it is pure for that e-locus gene, and does not have other genes that affect the pattern or color.)