I know what you mean about the various opinions on what constitutes a "Scottish" blend. I'm not familiar with C&D's Bayou Night, but there are certainly other blends out there (most notable to me being Mac Baren's Scottish Mixture) which don't fit the more commonly held definition of what is "Scottish". At the risk of taking this thread completely off-topic (not my intent), here are two competing definitions of "Scottish" that I've come across in my past dive into this question:
1) Always contain a Cavendish (unflavored black cavendish), Latakia, and Virginia but little to no Orientals
2) English blends that contain enough Cavendish to qualify as a light aromatic (essentially aromatic English mixtures). Like English blends, use predominantly Virginia base, but significantly less Latakia and potentially no Oriental; may contain a greater proportion of Cavendish or may be slightly aromatic; given association with Scotland may often be flavored with whisky
Whatever definition anyone wants to use, I personally would definitely consider both Red Rapparee and Black Mallory as true Scottish blends...