This is useful and good to know. In the Fifth Circuit, “alternative holdings are binding precedent and not obiter dictum.” Pruitt v. Levi Strauss & Co., 932 F.2d 458, 465 (5th Cir. 1991), abrogated on other grounds by Floors Unlimited, Inc. v. Fieldcrest Cannon, Inc., 55 F.3d 181 (5th Cir. 1995); see Perez v. Stephens, 784 F.3d 276, 281 (5th Cir. 2015) (citing Pruitt for this proposition). In other words, a decision that is not necessary to support the ultimate ruling, and all stated alternative rationales for a given result, have precedential value. Pruitt, 932 F.2d at 465 (citing cases). I haven’t checked to see how this plays out in other circuits, but in the Fifth (at least) you can rely on alternative rulings and rationales.