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My own guess from looking at hatchery blr, probably from crosses with gold laced. Splash blr x gl, sex doesn't matter, will give all "blr" with the red being variable. Plus no silver chicks to worry about. That's an 'effective' way to mass produce "blrs"..
It's other way around for sex linked mating- hens need to have the sex linked trait & rooster lacking it.. in this case sl hens and blr roo for non-silver daughters. Silver roo will throw 100% silver offspring. Perhaps useful hint for remembering it is barred rock hens are extensively used for sex linked mating.. RIR roo x BR hens= black sex links.