There is an old adage (?):
"Those who can't do - teach !"
Personally I prefer:
"In order to teach something well, you must be able to do it well yourself"
I completely agree that inexperienced instructors need to be able to instruct in order to become highly experienced instructors, but I want the guy (Sorry! - I have only ever met one female who could fly an aeroplane well) teaching me Single Pilot ME IFR to be very experienced in SP ME IFR. I can live with him being not highly experienced as an instructor (but not by much when he starts pulling engines on me).
Unhinged - Of the 5 only ME IFR instructors I have flown with in the last 20 years, Sideshow Bob may be an anomaly. I don't know his full back ground, but I suspect he has been an instructor for the great majority of his time in GA. However, by the time I found him he had learnt his craft. He can do it, and do it well !
Dr 