"Silver Laced carry the columbian gene naturally (they are columbian laced.) If you hatch enough Silver Laced you *will* hatch birds that lack the necessary lacing genes and they will just be columbians."
I believe the user that posted this was actually the owner of CrazyEweFarms seen here...
I misread that as 2019. I read somewhere that SLO can throw Columbian on occasion because they have Columbian genes. Especially if they have anything else going on in their back ground...