Anyone who got an ATPL previously, did so with unknown & untested multi-crew management skills
Multi crew management skills. What a laugh. Let's face it, we are talking about two pilots sitting next to each other in an aircraft cockpit. Surely, no professional "skills" are needed for that simple task - other than old fashioned good manners, a modicum of common sense and respect for each person's technical opinion.
Every airline still has it's occasional Captain Queeg in the left seat or its First Officer Sullen and Uncooperative in the right hand seat. All the MCC courses in the world including CRM and TEM or the latest fad terms, are never going to change a person's basic personality flaws - if they exist.
MCC courses have turned into yet another aviation cottage industry from which most pilots learn nothing that they didn't already know - and pay through the nose for the pleasure