I am a geriatric and was also an ex-check airman. There were instances whereby my checkees corrected me, especially when there were variations in items caused by aircraft differences or new procedures that were not that clear cut. As a checker I usually cleared my checkees in such instances unless there were items that seriously jeopardised the safety of the flight.
We all learnt from our checkees and hopefully, they from us. There were many instances whereby old habits and dogma led to " negative training ". It was my experience that many gung ho, kick ass A type personalities were guilty of such negative training.
I am not that far away from meeting my maker and I certainly take no offence at all regarding all the posts on this thread. I think they can serve as a pleasant nudge to wake up rather than a rude shuddering awakening for some of our more gung ho colleagues.
As for baba, please do go and see your old instructor. He has indeed made amends with his reflections and confessions. With you putting it here in the forum, his case certainly will hopefully awaken some to the errors of their ways. This itself, in a small way, is priceless. Good luck and fair winds.