Yeah but that's not exactly of importance here. That works for Arctic airmasses with a guaranteed front end thump (President's Day 2016, Feb 21 2015 for example). Those were cold temp days with dews in the single digits for most before precip. Here we have an iffy airmass (albeit pretty good for December standards), and precip is running alongside temps. By the time precip is on our doorstep, we're already close to changeover regardless of CAD or not. If we had a mid-winter airmass with precip going directly under us then yeah I'd side with the CAD argument, but that doesn't matter here it seems