I agree - an interesting analysis. Do AB pilots perhaps instinctively view the T/Ls as 'selectors' for a given mode? If so, then 'retarding' is a means of placing the T/L into the mode where reverse can be selected. Ipso facto, since there was (?presumably?) no intention of using reverse on No 2...................................
Have we, with FS's help, identified the flaw in the training? In the mindset, 'something else' in the system will look after No 2. No 1 MUST be retarded to get reverse. I think I can see how that train of thought could be inculcated.
Now, when No 2 has NOT gone to ilde, as perhaps 'expected',
"Look this"?
Comments from AB pilots? What did you come away with from training as a concept for the 'throttle quadrant' function on the 320?
It could be horrifically simple.