Scott v Sandford did not appear out of thin air, without a history. Although Negro citizenship and the restriction on slavery in the territories in the Missouri Compromise were not part of Emerson, other issues did. Fehrenbacher notes that Scott's attorney, Montgomery Blair, "drew heavily from Judge Gamble's dissenting opinion in Scott v Emerson." Fehrenbacher also notes that the "defence counsel reiterated the arguments previously used in Sanford's behalf."
My comment that these cases were "all part of the Dred Scott record" is quite true.
When attributed to Scott v. Sandford, it is scurrilous bullcrap. When then trying to lie your way out by saying it is part of the Dred Scott record, it is pathetic.