"I was shown the approach and landing "from 120 kts " over the fence by a very knowledgeable and well respected ex jet captain with many thousands of hours as well as instructing"
Even worse - an utter show off who should know better. I too have nearly 10 000 hours and around 4000 instructional, on things from Chipmunk to Vulcan to Phantom to VC10, but now I instruct on the PA28 as my main flying activity I teach people to fly it the way it is safe to fly it.
Whoever 'Andy' is, he deserves nothing but contempt for such a stupid demonstration of how NOT to fly an aeroplane - and a sound kick up the backside!
ADF and the RBI. My tip for the rotatable compass card design is to use 360 at the top when tracking, so that drift can more easily be applied, but to set DI to compass, then rotate RBI to match DI when position fixing. No ADF will ever give you range, slant or otherwise. For that you need DME!
A bit silly to squeeze ADF, VOR, DME and GPS all into the one lesson, in my view. You really need a good ground brief, then a lesson devoted to each, including how to use them when augmenting traditional visual navigation techniques.