in my experience i would not deem it necessary for a supervisor to have an advanced card,
Alot of scaffs in our trade without advanced cards have a wealth of experience across vast industry sectors, Nuclear, infrastucture, petrol chemical, off shore to name but a few.
My view is some lesser card holders are at a disadvantage because of the card they hold, experience counts for a lot. Hence its nice to see some employers out there who still employ scaffs not for the card they hold, but for what they can do.