If the co-pilots in the company you work for aren't capable of intervening if things start to go wrong then the CRM training is insufficient or the type of co-pilot the company is recruiting is may be of the wrong type!
Interesting: you assume that the captain is never wrong.
one co-pilot with minimum legal requirements, CRM and no experience will not act as an experienced co-pilot.
Call it as you like, on-job training or
experience, the co-pilot willl be the product of the captains he flies with. CRM should work on both pilots. Crew Resource
management Course continues in the cockpit. The captain himself will lead a new co-pilot to higher standards.