The early DEC courses are probably non-type rated, as they will (probably) take longer to get all the way through to completion of line training than type rated f/o’s who are just changing seat. The plan will presumably be worked out to avoid having too many people finishing line training and sitting around not flying whilst most of the winter flying program is used to line train others.... sensible order (probably) would be non type rated DEC and F/O, then type rated upgrades and type rated DEC and F/O. Just a guess.