Given that this line is from a cell culture, wouldn’t the simpler explanation be that the virus has this sequence because it was replicated in that specific Mo

Given that this line is from a cell culture, wouldn’t the simpler explanation be that the virus has this sequence because it was replicated in that specific Moderna culture lineage? This would be a particularly useful discovery, because it would dramatically limit the candidates for who did the gain of function research to organizations licensed this Moderna lineage.