From what I have read... blacks that carry a lot of Ml can give the appearance of lacing. Without Pg/Pg gene being present. This seems to be heaving "edging". Those that breed excellent Blue Andalusians do not breed back to black. They only breed blue to blue.
I am only at the beginning stages of my lacing project but was told that none of our blue ameraucana birds carry Pg/Pg. I don't know if Pg/Pg can be created any other way but to breed a bird in that actually carries the genetics.
It is the same with marans. There are none that carry the actual pattern genes. I have some blue coppers that seem to have a very nice border around their feathers. But this is only edging caused by Ml/Ml not actual pattern genes. Well.... Ml/Ml is one of the ingredients to lacing but not all of it for sure.
Like I said I am only at the beginning stages of this project so do not have years of laced bird raising experience but have done a bunch of research on it.
I am very interested to find out if your bantams really do have pattern genes... if so someone had to have bred it in. And I would really like to figure out what kind of bird was used to do this.
Forgive me... laced blue Ams is my obsession.